treewide: Per RFC45, remove all unquoted URLs

118 files changed, 140 insertions, 140 deletions

diff --git a/pkgs/applications/graphics/ImageMagick/7.0.nix b/pkgs/applications/graphics/ImageMagick/7.0.nix
index 31eebf7d0a9f3..c07c3957254b2 100644
--- a/pkgs/applications/graphics/ImageMagick/7.0.nix
+++ b/pkgs/applications/graphics/ImageMagick/7.0.nix
@@ -80,7 +80,7 @@ stdenv.mkDerivation {
   '';
 
   meta = with stdenv.lib; {
-    homepage = http://www.imagemagick.org/;
+    homepage = "http://www.imagemagick.org/";
     description = "A software suite to create, edit, compose, or convert bitmap images";
     platforms = platforms.linux ++ platforms.darwin;
     license = licenses.asl20;
diff --git a/pkgs/applications/graphics/ImageMagick/default.nix b/pkgs/applications/graphics/ImageMagick/default.nix
index 9cfccc7425bb6..57ce02bb66109 100644
--- a/pkgs/applications/graphics/ImageMagick/default.nix
+++ b/pkgs/applications/graphics/ImageMagick/default.nix
@@ -96,7 +96,7 @@ stdenv.mkDerivation {
   '';
 
   meta = with stdenv.lib; {
-    homepage = http://www.imagemagick.org/;
+    homepage = "http://www.imagemagick.org/";
     description = "A software suite to create, edit, compose, or convert bitmap images";
     platforms = platforms.linux ++ platforms.darwin;
     maintainers = with maintainers; [ the-kenny ];
diff --git a/pkgs/applications/graphics/PythonMagick/default.nix b/pkgs/applications/graphics/PythonMagick/default.nix
index e35a0190d8bc6..487648d07ca1a 100644
--- a/pkgs/applications/graphics/PythonMagick/default.nix
+++ b/pkgs/applications/graphics/PythonMagick/default.nix
@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
   buildInputs = [ python python.pkgs.boost imagemagick ];
 
   meta = with stdenv.lib; {
-    homepage = http://www.imagemagick.org/script/api.php;
+    homepage = "http://www.imagemagick.org/script/api.php";
     license = licenses.imagemagick;
     description = "PythonMagick provides object oriented bindings for the ImageMagick Library.";
   };
diff --git a/pkgs/applications/graphics/ahoviewer/default.nix b/pkgs/applications/graphics/ahoviewer/default.nix
index 87bddf9099ee2..c5f1bf8680185 100644
--- a/pkgs/applications/graphics/ahoviewer/default.nix
+++ b/pkgs/applications/graphics/ahoviewer/default.nix
@@ -40,7 +40,7 @@ stdenv.mkDerivation rec {
   '';
 
   meta = with stdenv.lib; {
-    homepage = https://github.com/ahodesuka/ahoviewer;
+    homepage = "https://github.com/ahodesuka/ahoviewer";
     description = "A GTK2 image viewer, manga reader, and booru browser";
     maintainers = with maintainers; [ skrzyp xzfc ];
     license = licenses.mit;
diff --git a/pkgs/applications/graphics/alchemy/default.nix b/pkgs/applications/graphics/alchemy/default.nix
index 5132d5950aab8..6fc84e088dd39 100644
--- a/pkgs/applications/graphics/alchemy/default.nix
+++ b/pkgs/applications/graphics/alchemy/default.nix
@@ -32,7 +32,7 @@ stdenv.mkDerivation rec {
       Experimental in nature, Alchemy lets you brainstorm visually to explore
       an expanded range of ideas and possibilities in a serendipitous way.
     '';
-    homepage = http://al.chemy.org/;
+    homepage = "http://al.chemy.org/";
     license = licenses.gpl3Plus;
     maintainers = [ maintainers.marcweber ];
     platforms = platforms.linux;
diff --git a/pkgs/applications/graphics/animbar/default.nix b/pkgs/applications/graphics/animbar/default.nix
index c4f1b4218d079..771145d54b65f 100644
--- a/pkgs/applications/graphics/animbar/default.nix
+++ b/pkgs/applications/graphics/animbar/default.nix
@@ -31,7 +31,7 @@ stdenv.mkDerivation rec {
 	names: picket fence animation, barrier grid animation, Moiré
 	animation, to name a few.
     '';
-    homepage = http://animbar.mnim.org;
+    homepage = "http://animbar.mnim.org";
     maintainers = with maintainers; [ leenaars ];
     platforms = platforms.linux;
     license = licenses.gpl3;
diff --git a/pkgs/applications/graphics/antimony/default.nix b/pkgs/applications/graphics/antimony/default.nix
index 75ba3ecd55dc2..363f3b8c84d90 100644
--- a/pkgs/applications/graphics/antimony/default.nix
+++ b/pkgs/applications/graphics/antimony/default.nix
@@ -44,7 +44,7 @@ in
 
     meta = with stdenv.lib; {
       description = "A computer-aided design (CAD) tool from a parallel universe";
-      homepage    = https://github.com/mkeeter/antimony;
+      homepage    = "https://github.com/mkeeter/antimony";
       license     = licenses.mit;
       maintainers = with maintainers; [ rnhmjoj ];
       platforms   = platforms.linux;
diff --git a/pkgs/applications/graphics/apitrace/default.nix b/pkgs/applications/graphics/apitrace/default.nix
index 5ce36f4f10e98..f6f9cb281a772 100644
--- a/pkgs/applications/graphics/apitrace/default.nix
+++ b/pkgs/applications/graphics/apitrace/default.nix
@@ -18,7 +18,7 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ cmake ];
 
   meta = with stdenv.lib; {
-    homepage = https://apitrace.github.io;
+    homepage = "https://apitrace.github.io";
     description = "Tools to trace OpenGL, OpenGL ES, Direct3D, and DirectDraw APIs";
     license = licenses.mit;
     platforms = platforms.linux;
diff --git a/pkgs/applications/graphics/autopanosiftc/default.nix b/pkgs/applications/graphics/autopanosiftc/default.nix
index c64604975ab01..14af98ebc48ba 100644
--- a/pkgs/applications/graphics/autopanosiftc/default.nix
+++ b/pkgs/applications/graphics/autopanosiftc/default.nix
@@ -4,7 +4,7 @@ stdenv.mkDerivation {
   name = "autopano-sift-C-2.5.1";
 
   src = fetchurl {
-    url = mirror://sourceforge/hugin/autopano-sift-C-2.5.1.tar.gz;
+    url = "mirror://sourceforge/hugin/autopano-sift-C-2.5.1.tar.gz";
     sha256 = "0dqk8ff82gmy4v5ns5nr9gpzkc1p7c2y8c8fkid102r47wsjk44s";
   };
 
@@ -12,13 +12,13 @@ stdenv.mkDerivation {
 
   patches = [
     (fetchurl {
-      url = https://gitweb.gentoo.org/repo/gentoo.git/plain/media-gfx/autopano-sift-C/files/autopano-sift-C-2.5.1-lm.patch;
+      url = "https://gitweb.gentoo.org/repo/gentoo.git/plain/media-gfx/autopano-sift-C/files/autopano-sift-C-2.5.1-lm.patch";
       sha256 = "1bfcr5sps0ip9gl4jprji5jgf9wkczz6d2clsjjlbsy8r3ixi3lv";
     })
   ];
 
   meta = {
-    homepage = http://hugin.sourceforge.net/;
+    homepage = "http://hugin.sourceforge.net/";
     description = "Implementation in C of the autopano-sift algorithm for automatically stitching panoramas";
     license = stdenv.lib.licenses.gpl2;
     platforms = stdenv.lib.platforms.linux;
diff --git a/pkgs/applications/graphics/autotrace/default.nix b/pkgs/applications/graphics/autotrace/default.nix
index 57e95dfef1063..cd7937f8a5498 100644
--- a/pkgs/applications/graphics/autotrace/default.nix
+++ b/pkgs/applications/graphics/autotrace/default.nix
@@ -62,7 +62,7 @@ stdenv.mkDerivation rec {
   '';
 
   meta = with stdenv.lib; {
-    homepage = http://autotrace.sourceforge.net/;
+    homepage = "http://autotrace.sourceforge.net/";
     description = "Utility for converting bitmap into vector graphics";
     platforms = platforms.unix;
     maintainers = with maintainers; [ hodapp ];
diff --git a/pkgs/applications/graphics/awesomebump/default.nix b/pkgs/applications/graphics/awesomebump/default.nix
index b827a12f81c82..c02140e1905df 100644
--- a/pkgs/applications/graphics/awesomebump/default.nix
+++ b/pkgs/applications/graphics/awesomebump/default.nix
@@ -53,7 +53,7 @@ in stdenv.mkDerivation {
   enableParallelBuilding = false;
 
   meta = {
-    homepage = https://github.com/kmkolasinski/AwesomeBump;
+    homepage = "https://github.com/kmkolasinski/AwesomeBump";
     description = "A program to generate normal, height, specular or ambient occlusion textures from a single image";
     license = lib.licenses.gpl3Plus;
     maintainers = [ lib.maintainers.eelco ];
diff --git a/pkgs/applications/graphics/batik/default.nix b/pkgs/applications/graphics/batik/default.nix
index 51156dea4a17f..3c78c8b6dbd23 100644
--- a/pkgs/applications/graphics/batik/default.nix
+++ b/pkgs/applications/graphics/batik/default.nix
@@ -4,7 +4,7 @@ stdenv.mkDerivation {
   name = "batik-1.6";
   builder = ./builder.sh;
   src = fetchurl {
-    url = http://tarballs.nixos.org/batik-1.6.zip;
+    url = "http://tarballs.nixos.org/batik-1.6.zip";
     sha256 = "0cf15dspmzcnfda8w5lbsdx28m4v2rpq1dv5zx0r0n99ihqd1sh6";
   };
 
@@ -12,7 +12,7 @@ stdenv.mkDerivation {
 
   meta = with stdenv.lib; {
     description = "Java based toolkit for handling SVG";
-    homepage = https://xmlgraphics.apache.org/batik;
+    homepage = "https://xmlgraphics.apache.org/batik";
     license = licenses.asl20;
     platforms = platforms.unix;
     knownVulnerabilities = [
diff --git a/pkgs/applications/graphics/c3d/default.nix b/pkgs/applications/graphics/c3d/default.nix
index 55a5d49f7524c..61efec8dc9d45 100644
--- a/pkgs/applications/graphics/c3d/default.nix
+++ b/pkgs/applications/graphics/c3d/default.nix
@@ -15,7 +15,7 @@ stdenv.mkDerivation {
     ++ stdenv.lib.optional stdenv.isDarwin Cocoa;
 
   meta = with stdenv.lib; {
-    homepage = http://www.itksnap.org/c3d;
+    homepage = "http://www.itksnap.org/c3d";
     description = "Medical imaging processing tool";
     maintainers = with maintainers; [ bcdarwin ];
     platforms = platforms.unix;
diff --git a/pkgs/applications/graphics/comical/default.nix b/pkgs/applications/graphics/comical/default.nix
index 2796a5535a03f..8e6e151aff6a4 100644
--- a/pkgs/applications/graphics/comical/default.nix
+++ b/pkgs/applications/graphics/comical/default.nix
@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
 
   meta = {
     description = "Viewer of CBR and CBZ files, often used to store scanned comics";
-    homepage = http://comical.sourceforge.net/;
+    homepage = "http://comical.sourceforge.net/";
     license = stdenv.lib.licenses.gpl2Plus;
     maintainers = with stdenv.lib.maintainers; [viric];
     platforms = with stdenv.lib.platforms; linux;
diff --git a/pkgs/applications/graphics/deskew/default.nix b/pkgs/applications/graphics/deskew/default.nix
index c35aaa044aef7..422c7a0e15e80 100644
--- a/pkgs/applications/graphics/deskew/default.nix
+++ b/pkgs/applications/graphics/deskew/default.nix
@@ -28,7 +28,7 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     description = "A command line tool for deskewing scanned text documents";
-    homepage = https://bitbucket.org/galfar/app-deskew/overview;
+    homepage = "https://bitbucket.org/galfar/app-deskew/overview";
     license = licenses.mit;
     maintainers = with maintainers; [ryantm];
     platforms = platforms.all;
diff --git a/pkgs/applications/graphics/dia/default.nix b/pkgs/applications/graphics/dia/default.nix
index 3984cfc17ca5e..6ec54201fbfa5 100644
--- a/pkgs/applications/graphics/dia/default.nix
+++ b/pkgs/applications/graphics/dia/default.nix
@@ -8,7 +8,7 @@ stdenv.mkDerivation {
   version = "0.97.3.20170622";
 
   src = fetchgit {
-    url = https://gitlab.gnome.org/GNOME/dia.git;
+    url = "https://gitlab.gnome.org/GNOME/dia.git";
     rev = "b86085dfe2b048a2d37d587adf8ceba6fb8bc43c";
     sha256 = "1fyxfrzdcs6blxhkw3bcgkksaf3byrsj4cbyrqgb4869k3ynap96";
   };
@@ -31,7 +31,7 @@ stdenv.mkDerivation {
 
   meta = with stdenv.lib; {
     description = "Gnome Diagram drawing software";
-    homepage = http://live.gnome.org/Dia;
+    homepage = "http://live.gnome.org/Dia";
     maintainers = with maintainers; [ raskin ];
     license = licenses.gpl2;
     platforms = platforms.unix;
diff --git a/pkgs/applications/graphics/digikam/default.nix b/pkgs/applications/graphics/digikam/default.nix
index e6e24e0e56f5d..50162166013e3 100644
--- a/pkgs/applications/graphics/digikam/default.nix
+++ b/pkgs/applications/graphics/digikam/default.nix
@@ -125,7 +125,7 @@ mkDerivation rec {
   meta = with lib; {
     description = "Photo Management Program";
     license = licenses.gpl2;
-    homepage = https://www.digikam.org;
+    homepage = "https://www.digikam.org";
     maintainers = with maintainers; [ the-kenny ];
     platforms = platforms.linux;
   };
diff --git a/pkgs/applications/graphics/displaycal/default.nix b/pkgs/applications/graphics/displaycal/default.nix
index 7a4db535b2b0d..7a99361a03d9f 100644
--- a/pkgs/applications/graphics/displaycal/default.nix
+++ b/pkgs/applications/graphics/displaycal/default.nix
@@ -20,7 +20,7 @@ in buildPythonApplication {
   enableParallelBuilding = true;
 
   src = fetchurl {
-    url = mirror://sourceforge/project/dispcalgui/release/3.5.0.0/DisplayCAL-3.5.0.0.tar.gz;
+    url = "mirror://sourceforge/project/dispcalgui/release/3.5.0.0/DisplayCAL-3.5.0.0.tar.gz";
     sha256 = "1j496sv8pbhby5hkkbp07k6bs3f7mb1l3dijmn2iga3kmix0fn5q";
   };
 
@@ -62,7 +62,7 @@ in buildPythonApplication {
 
   meta = {
     description = "Display Calibration and Characterization powered by Argyll CMS";
-    homepage = https://displaycal.net/;
+    homepage = "https://displaycal.net/";
     license = stdenv.lib.licenses.gpl3;
     maintainers = [stdenv.lib.maintainers.marcweber];
     platforms = stdenv.lib.platforms.linux;
diff --git a/pkgs/applications/graphics/dosage/default.nix b/pkgs/applications/graphics/dosage/default.nix
index e26886b070e5e..b491c3e3ead09 100644
--- a/pkgs/applications/graphics/dosage/default.nix
+++ b/pkgs/applications/graphics/dosage/default.nix
@@ -22,7 +22,7 @@ python3Packages.buildPythonApplication rec {
 
   meta = {
     description = "A comic strip downloader and archiver";
-    homepage = https://dosage.rocks/;
+    homepage = "https://dosage.rocks/";
     license = stdenv.lib.licenses.mit;
   };
 }
diff --git a/pkgs/applications/graphics/draftsight/default.nix b/pkgs/applications/graphics/draftsight/default.nix
index 144c723da20f0..ccd4fd660f76c 100644
--- a/pkgs/applications/graphics/draftsight/default.nix
+++ b/pkgs/applications/graphics/draftsight/default.nix
@@ -80,7 +80,7 @@ stdenv.mkDerivation {
   meta = with stdenv.lib; {
     description = "2D design & drafting application, meant to be similar to AutoCAD";
     longDescription = "Professional-grade 2D design and drafting solution from Dassault Systèmes that lets you create, edit, view and mark up any kind of 2D CAD drawing.";
-    homepage = https://www.3ds.com/products-services/draftsight-cad-software/;
+    homepage = "https://www.3ds.com/products-services/draftsight-cad-software/";
     license = stdenv.lib.licenses.unfree;
     maintainers = with maintainers; [ hodapp ];
     platforms = [ "x86_64-linux" ];
diff --git a/pkgs/applications/graphics/drawpile/default.nix b/pkgs/applications/graphics/drawpile/default.nix
index a8c4e6d14ba94..0ffcb5cdb410d 100644
--- a/pkgs/applications/graphics/drawpile/default.nix
+++ b/pkgs/applications/graphics/drawpile/default.nix
@@ -86,8 +86,8 @@ in mkDerivation rec {
 
   meta = {
     description = "A collaborative drawing program that allows multiple users to sketch on the same canvas simultaneously";
-    homepage = https://drawpile.net/;
-    downloadPage = https://drawpile.net/download/;
+    homepage = "https://drawpile.net/";
+    downloadPage = "https://drawpile.net/download/";
     license = licenses.gpl3;
     maintainers = with maintainers; [ fgaz ];
     platforms = platforms.unix;
diff --git a/pkgs/applications/graphics/epeg/default.nix b/pkgs/applications/graphics/epeg/default.nix
index 3b7bdfb8efc2d..bdbdf04bcd504 100644
--- a/pkgs/applications/graphics/epeg/default.nix
+++ b/pkgs/applications/graphics/epeg/default.nix
@@ -24,7 +24,7 @@ stdenv.mkDerivation rec {
   '';
 
   meta = with stdenv.lib; {
-    homepage = https://github.com/mattes/epeg;
+    homepage = "https://github.com/mattes/epeg";
     description = "Insanely fast JPEG/ JPG thumbnail scaling";
     platforms = platforms.linux ++ platforms.darwin;
     license = {
diff --git a/pkgs/applications/graphics/exrdisplay/default.nix b/pkgs/applications/graphics/exrdisplay/default.nix
index d8b08faf23982..7841e9d571b74 100644
--- a/pkgs/applications/graphics/exrdisplay/default.nix
+++ b/pkgs/applications/graphics/exrdisplay/default.nix
@@ -21,7 +21,7 @@ stdenv.mkDerivation {
 
   meta = {
     description = "Application for viewing OpenEXR images on a display at various exposure settings";
-    homepage = http://openexr.com;
+    homepage = "http://openexr.com";
     platforms = stdenv.lib.platforms.linux;
     license = stdenv.lib.licenses.bsd3;
   };
diff --git a/pkgs/applications/graphics/exrtools/default.nix b/pkgs/applications/graphics/exrtools/default.nix
index c8928540bb656..39c23eb4fe8c3 100644
--- a/pkgs/applications/graphics/exrtools/default.nix
+++ b/pkgs/applications/graphics/exrtools/default.nix
@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     description = "Collection of utilities for manipulating OpenEXR images";
-    homepage = http://scanline.ca/exrtools;
+    homepage = "http://scanline.ca/exrtools";
     platforms = platforms.linux;
     license = licenses.mit;
     maintainers = [ maintainers.juliendehos ];
diff --git a/pkgs/applications/graphics/fbida/default.nix b/pkgs/applications/graphics/fbida/default.nix
index 3e64783df3165..7f0167f983424 100644
--- a/pkgs/applications/graphics/fbida/default.nix
+++ b/pkgs/applications/graphics/fbida/default.nix
@@ -26,7 +26,7 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     description = "Image viewing and manipulation programs including fbi, fbgs, ida, exiftran and thumbnail.cgi";
-    homepage = https://www.kraxel.org/blog/linux/fbida/;
+    homepage = "https://www.kraxel.org/blog/linux/fbida/";
     license = licenses.gpl2;
     maintainers = with maintainers; [ pSub ];
     platforms = platforms.linux;
diff --git a/pkgs/applications/graphics/fig2dev/default.nix b/pkgs/applications/graphics/fig2dev/default.nix
index c364badc1742f..cd7db3d29c50d 100644
--- a/pkgs/applications/graphics/fig2dev/default.nix
+++ b/pkgs/applications/graphics/fig2dev/default.nix
@@ -18,7 +18,7 @@ in stdenv.mkDerivation {
 
   meta = with stdenv.lib; {
     description = "Tool to convert Xfig files to other formats";
-    homepage = http://mcj.sourceforge.net/;
+    homepage = "http://mcj.sourceforge.net/";
     license = licenses.xfig;
     platforms = platforms.linux;
   };
diff --git a/pkgs/applications/graphics/fluxus/default.nix b/pkgs/applications/graphics/fluxus/default.nix
index d7841fde82377..a53eb806bcf1b 100644
--- a/pkgs/applications/graphics/fluxus/default.nix
+++ b/pkgs/applications/graphics/fluxus/default.nix
@@ -90,7 +90,7 @@ stdenv.mkDerivation rec {
   meta = with stdenv.lib; {
     description = "Livecoding environment for 3D graphics, sound, and games";
     license = licenses.gpl2;
-    homepage = http://www.pawfal.org/fluxus/;
+    homepage = "http://www.pawfal.org/fluxus/";
     maintainers = [ maintainers.brainrape ];
   };
 }
diff --git a/pkgs/applications/graphics/fondo/default.nix b/pkgs/applications/graphics/fondo/default.nix
index 7b186312301d1..877328e8823ea 100644
--- a/pkgs/applications/graphics/fondo/default.nix
+++ b/pkgs/applications/graphics/fondo/default.nix
@@ -65,7 +65,7 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     description = "Find the most beautiful wallpapers for your desktop";
-    homepage = https://github.com/calo001/fondo;
+    homepage = "https://github.com/calo001/fondo";
     license = licenses.agpl3Plus;
     maintainers = with maintainers; [ worldofpeace ];
     platforms = platforms.linux;
diff --git a/pkgs/applications/graphics/fontmatrix/default.nix b/pkgs/applications/graphics/fontmatrix/default.nix
index 3b86629760327..99ca119b3bcd3 100644
--- a/pkgs/applications/graphics/fontmatrix/default.nix
+++ b/pkgs/applications/graphics/fontmatrix/default.nix
@@ -19,7 +19,7 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     description = "Fontmatrix is a free/libre font explorer for Linux, Windows and Mac";
-    homepage = https://github.com/fontmatrix/fontmatrix;
+    homepage = "https://github.com/fontmatrix/fontmatrix";
     license = licenses.gpl2;
     platforms = platforms.linux;
   };
diff --git a/pkgs/applications/graphics/freepv/default.nix b/pkgs/applications/graphics/freepv/default.nix
index 57321220fb144..11d203746e1ae 100644
--- a/pkgs/applications/graphics/freepv/default.nix
+++ b/pkgs/applications/graphics/freepv/default.nix
@@ -5,7 +5,7 @@ stdenv.mkDerivation {
   name = "freepv-0.3.0";
 
   src = fetchurl {
-    url = mirror://sourceforge/freepv/freepv-0.3.0.tar.gz;
+    url = "mirror://sourceforge/freepv/freepv-0.3.0.tar.gz";
     sha256 = "1w19abqjn64w47m35alg7bcdl1p97nf11zn64cp4p0dydihmhv56";
   };
 
@@ -29,7 +29,7 @@ stdenv.mkDerivation {
 
   meta = {
     description = "Open source panorama viewer using GL";
-    homepage = http://freepv.sourceforge.net/;
+    homepage = "http://freepv.sourceforge.net/";
     license = [ stdenv.lib.licenses.lgpl21 ];
   };
 }
diff --git a/pkgs/applications/graphics/gcolor2/default.nix b/pkgs/applications/graphics/gcolor2/default.nix
index f729c9c2bba21..f585a0c5d29c1 100644
--- a/pkgs/applications/graphics/gcolor2/default.nix
+++ b/pkgs/applications/graphics/gcolor2/default.nix
@@ -26,7 +26,7 @@ stdenv.mkDerivation {
 
   meta = {
     description = "Simple GTK 2 color selector";
-    homepage = http://gcolor2.sourceforge.net/;
+    homepage = "http://gcolor2.sourceforge.net/";
     license = stdenv.lib.licenses.gpl2Plus;
     maintainers = with stdenv.lib.maintainers; [ notthemessiah ];
     platforms = with stdenv.lib.platforms; unix;
diff --git a/pkgs/applications/graphics/gcolor3/default.nix b/pkgs/applications/graphics/gcolor3/default.nix
index 67be3ba6782c8..1c1c6ba08ee28 100644
--- a/pkgs/applications/graphics/gcolor3/default.nix
+++ b/pkgs/applications/graphics/gcolor3/default.nix
@@ -34,7 +34,7 @@ in stdenv.mkDerivation {
 
   meta = with stdenv.lib; {
     description = "A simple color chooser written in GTK3";
-    homepage = https://www.hjdskes.nl/projects/gcolor3/;
+    homepage = "https://www.hjdskes.nl/projects/gcolor3/";
     license = licenses.gpl2Plus;
     maintainers = with maintainers; [ jtojnar ];
     platforms = platforms.unix;
diff --git a/pkgs/applications/graphics/geeqie/default.nix b/pkgs/applications/graphics/geeqie/default.nix
index 4275c6f0dcfd3..51c066196efde 100644
--- a/pkgs/applications/graphics/geeqie/default.nix
+++ b/pkgs/applications/graphics/geeqie/default.nix
@@ -61,7 +61,7 @@ stdenv.mkDerivation rec {
 
     license = licenses.gpl2Plus;
 
-    homepage = http://geeqie.sourceforge.net;
+    homepage = "http://geeqie.sourceforge.net";
 
     maintainers = with maintainers; [ jfrankenau pSub ];
     platforms = platforms.gnu ++ platforms.linux;
diff --git a/pkgs/applications/graphics/gimp/plugins/default.nix b/pkgs/applications/graphics/gimp/plugins/default.nix
index 0a06c42b5fc01..0b5e6a7f379f0 100644
--- a/pkgs/applications/graphics/gimp/plugins/default.nix
+++ b/pkgs/applications/graphics/gimp/plugins/default.nix
@@ -45,7 +45,7 @@ stdenv.lib.makeScope pkgs.newScope (self: with self; {
     */
     name = "gap-2.6.0";
     src = fetchurl {
-      url = https://ftp.gimp.org/pub/gimp/plug-ins/v2.6/gap/gimp-gap-2.6.0.tar.bz2;
+      url = "https://ftp.gimp.org/pub/gimp/plug-ins/v2.6/gap/gimp-gap-2.6.0.tar.bz2";
       sha256 = "1jic7ixcmsn4kx2cn32nc5087rk6g8xsrz022xy11yfmgvhzb0ql";
     };
     NIX_LDFLAGS = "-lm";
@@ -56,7 +56,7 @@ stdenv.lib.makeScope pkgs.newScope (self: with self; {
     hardeningDisable = [ "format" ];
     meta = with stdenv.lib; {
       description = "The GIMP Animation Package";
-      homepage = https://www.gimp.org;
+      homepage = "https://www.gimp.org";
       # The main code is given in GPLv3, but it has ffmpeg in it, and I think ffmpeg license
       # falls inside "free".
       license = with licenses; [ gpl3 free ];
@@ -143,7 +143,7 @@ stdenv.lib.makeScope pkgs.newScope (self: with self; {
     name = "wavelet-sharpen-0.1.2";
     NIX_LDFLAGS = "-lm";
     src = fetchurl {
-      url = http://registry.gimp.org/files/wavelet-sharpen-0.1.2.tar.gz;
+      url = "http://registry.gimp.org/files/wavelet-sharpen-0.1.2.tar.gz";
       sha256 = "0vql1k67i21g5ivaa1jh56rg427m0icrkpryrhg75nscpirfxxqw";
     };
     installPhase = "installPlugins src/wavelet-sharpen"; # TODO translations are not copied .. How to do this on nix?
@@ -156,7 +156,7 @@ stdenv.lib.makeScope pkgs.newScope (self: with self; {
     name = "lqr-plugin-0.6.1";
     buildInputs = with pkgs; [ liblqr1 ];
     src = fetchurl {
-      url = http://registry.gimp.org/files/gimp-lqr-plugin-0.6.1.tar.bz2;
+      url = "http://registry.gimp.org/files/gimp-lqr-plugin-0.6.1.tar.bz2";
       sha256 = "00hklkpcimcbpjly4rjhfipaw096cpy768g9wixglwrsyqhil7l9";
     };
     #postInstall = ''mkdir -p $out/nix-support; echo "${liblqr1}" > "$out/nix-support/propagated-user-env-packages"'';
@@ -189,7 +189,7 @@ stdenv.lib.makeScope pkgs.newScope (self: with self; {
     meta = {
       description = "GIMP plugin to correct lens distortion using the lensfun library and database";
 
-      homepage = http://lensfun.sebastiankraft.net/;
+      homepage = "http://lensfun.sebastiankraft.net/";
 
       license = stdenv.lib.licenses.gpl3Plus;
       maintainers = [ ];
@@ -203,7 +203,7 @@ stdenv.lib.makeScope pkgs.newScope (self: with self; {
   exposureBlend = scriptDerivation {
     name = "exposure-blend";
     src = fetchurl {
-      url = http://tir.astro.utoledo.edu/jdsmith/code/eb/exposure-blend.scm;
+      url = "http://tir.astro.utoledo.edu/jdsmith/code/eb/exposure-blend.scm";
       sha256 = "1b6c9wzpklqras4wwsyw3y3jp6fjmhnnskqiwm5sabs8djknfxla";
     };
     meta.broken = true;
@@ -212,7 +212,7 @@ stdenv.lib.makeScope pkgs.newScope (self: with self; {
   lightning = scriptDerivation {
     name = "Lightning";
     src = fetchurl {
-      url = http://registry.gimp.org/files/Lightning.scm;
+      url = "http://registry.gimp.org/files/Lightning.scm";
       sha256 = "c14a8f4f709695ede3f77348728a25b3f3ded420da60f3f8de3944b7eae98a49";
     };
   };
@@ -235,7 +235,7 @@ stdenv.lib.makeScope pkgs.newScope (self: with self; {
     # http://registry.gimp.org/node/153
     name = "lightning-gate";
     src = fetchurl {
-      url = http://registry.gimp.org/files/LightningGate.scm;
+      url = "http://registry.gimp.org/files/LightningGate.scm";
       sha256 = "181w1zi9a99kn2mfxjp43wkwcgw5vbb6iqjas7a9mhm8p04csys2";
     };
   };
diff --git a/pkgs/applications/graphics/glabels/default.nix b/pkgs/applications/graphics/glabels/default.nix
index fef296f45be20..be487fcb8a6bd 100644
--- a/pkgs/applications/graphics/glabels/default.nix
+++ b/pkgs/applications/graphics/glabels/default.nix
@@ -33,7 +33,7 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     description = "Create labels and business cards";
-    homepage = https://glabels.org/;
+    homepage = "https://glabels.org/";
     license = with licenses; [ gpl3Plus lgpl3Plus ];
     platforms = platforms.unix;
     maintainers = [ maintainers.nico202 ];
diff --git a/pkgs/applications/graphics/gnome-photos/default.nix b/pkgs/applications/graphics/gnome-photos/default.nix
index 6cbe5448b40a2..3d0397528bce6 100644
--- a/pkgs/applications/graphics/gnome-photos/default.nix
+++ b/pkgs/applications/graphics/gnome-photos/default.nix
@@ -117,7 +117,7 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     description = "Access, organize and share your photos";
-    homepage = https://wiki.gnome.org/Apps/Photos;
+    homepage = "https://wiki.gnome.org/Apps/Photos";
     license = licenses.gpl3Plus;
     maintainers = gnome3.maintainers;
     platforms = platforms.linux;
diff --git a/pkgs/applications/graphics/gnuclad/default.nix b/pkgs/applications/graphics/gnuclad/default.nix
index 5b6dd42e09e55..fcb4bdb537437 100644
--- a/pkgs/applications/graphics/gnuclad/default.nix
+++ b/pkgs/applications/graphics/gnuclad/default.nix
@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ pkgconfig ];
 
   meta = with stdenv.lib; {
-    homepage = https://launchpad.net/gnuclad;
+    homepage = "https://launchpad.net/gnuclad";
     description = "gnuclad tries to help the environment by creating trees.  It's primary use will be generating cladogram trees for the GNU/Linux distro timeline project.";
     license = licenses.gpl3Plus;
     maintainers = with maintainers; [ mog ];
diff --git a/pkgs/applications/graphics/gocr/default.nix b/pkgs/applications/graphics/gocr/default.nix
index f5fa8ca9221dd..7c586374ec513 100644
--- a/pkgs/applications/graphics/gocr/default.nix
+++ b/pkgs/applications/graphics/gocr/default.nix
@@ -24,7 +24,7 @@ stdenv.mkDerivation rec {
   '';
 
   meta = {
-    homepage = http://jocr.sourceforge.net/;
+    homepage = "http://jocr.sourceforge.net/";
     description = "GPL Optical Character Recognition";
     license = stdenv.lib.licenses.gpl2;
     platforms = stdenv.lib.platforms.linux;
diff --git a/pkgs/applications/graphics/goxel/default.nix b/pkgs/applications/graphics/goxel/default.nix
index 84fdb60c31efc..6fb5b91c2a92d 100644
--- a/pkgs/applications/graphics/goxel/default.nix
+++ b/pkgs/applications/graphics/goxel/default.nix
@@ -28,7 +28,7 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     description = "Open Source 3D voxel editor";
-    homepage = https://guillaumechereau.github.io/goxel/;
+    homepage = "https://guillaumechereau.github.io/goxel/";
     license = licenses.gpl3;
     platforms = platforms.linux;
     maintainers = with maintainers; [ tilpner ];
diff --git a/pkgs/applications/graphics/gpicview/default.nix b/pkgs/applications/graphics/gpicview/default.nix
index 86867cd1cca73..9e3ab37c32233 100644
--- a/pkgs/applications/graphics/gpicview/default.nix
+++ b/pkgs/applications/graphics/gpicview/default.nix
@@ -17,8 +17,8 @@ stdenv.mkDerivation {
 
   meta = with stdenv.lib; {
     description = "A simple and fast image viewer for X";
-    homepage    = http://lxde.sourceforge.net/gpicview/;
-    repositories.git = git://lxde.git.sourceforge.net/gitroot/lxde/gpicview;
+    homepage    = "http://lxde.sourceforge.net/gpicview/";
+    repositories.git = "git://lxde.git.sourceforge.net/gitroot/lxde/gpicview";
     license     = licenses.gpl2;
     maintainers = with maintainers; [ lovek323 ];
     platforms   = platforms.unix;
diff --git a/pkgs/applications/graphics/gqview/default.nix b/pkgs/applications/graphics/gqview/default.nix
index d82238f925b38..965ac5db68219 100644
--- a/pkgs/applications/graphics/gqview/default.nix
+++ b/pkgs/applications/graphics/gqview/default.nix
@@ -9,7 +9,7 @@ stdenv.mkDerivation {
   name = "gqview-2.1.5";
 
   src = fetchurl {
-    url = mirror://sourceforge/gqview/gqview-2.1.5.tar.gz;
+    url = "mirror://sourceforge/gqview/gqview-2.1.5.tar.gz";
     sha256 = "0ilm5s7ps9kg4f5hzgjhg0xhn6zg0v9i7jnd67zrx9h7wsaa9zhj";
   };
 
@@ -22,7 +22,7 @@ stdenv.mkDerivation {
 
   meta = with stdenv.lib; {
     description = "A fast image viewer";
-    homepage = http://gqview.sourceforge.net;
+    homepage = "http://gqview.sourceforge.net";
     license = licenses.gpl2;
     platforms = platforms.unix;
   };
diff --git a/pkgs/applications/graphics/grafx2/default.nix b/pkgs/applications/graphics/grafx2/default.nix
index 039bb1917d37b..2a2a6a6759891 100644
--- a/pkgs/applications/graphics/grafx2/default.nix
+++ b/pkgs/applications/graphics/grafx2/default.nix
@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
 
   meta = {
     description = "Bitmap paint program inspired by the Amiga programs Deluxe Paint and Brilliance";
-    homepage = http://pulkomandy.tk/projects/GrafX2;
+    homepage = "http://pulkomandy.tk/projects/GrafX2";
     license = stdenv.lib.licenses.gpl2;
     platforms = [ "x86_64-linux" "i686-linux" ];
     maintainers = [ stdenv.lib.maintainers.zoomulator ];
diff --git a/pkgs/applications/graphics/graphicsmagick/default.nix b/pkgs/applications/graphics/graphicsmagick/default.nix
index 403a5285e1501..be5114565ff59 100644
--- a/pkgs/applications/graphics/graphicsmagick/default.nix
+++ b/pkgs/applications/graphics/graphicsmagick/default.nix
@@ -35,7 +35,7 @@ stdenv.mkDerivation rec {
   '';
 
   meta = {
-    homepage = http://www.graphicsmagick.org;
+    homepage = "http://www.graphicsmagick.org";
     description = "Swiss army knife of image processing";
     license = stdenv.lib.licenses.mit;
     platforms = stdenv.lib.platforms.all;
diff --git a/pkgs/applications/graphics/gscan2pdf/default.nix b/pkgs/applications/graphics/gscan2pdf/default.nix
index d8f91638b91df..352b6b900cc65 100644
--- a/pkgs/applications/graphics/gscan2pdf/default.nix
+++ b/pkgs/applications/graphics/gscan2pdf/default.nix
@@ -100,7 +100,7 @@ perlPackages.buildPerlPackage rec {
 
   meta = {
     description = "A GUI to produce PDFs or DjVus from scanned documents";
-    homepage = http://gscan2pdf.sourceforge.net/;
+    homepage = "http://gscan2pdf.sourceforge.net/";
     license = licenses.gpl3;
     maintainers = with maintainers; [ pacien ];
   };
diff --git a/pkgs/applications/graphics/guetzli/default.nix b/pkgs/applications/graphics/guetzli/default.nix
index d7b9642596838..ccddf907e94cc 100644
--- a/pkgs/applications/graphics/guetzli/default.nix
+++ b/pkgs/applications/graphics/guetzli/default.nix
@@ -22,7 +22,7 @@ stdenv.mkDerivation {
   meta = {
     description = "Perceptual JPEG encoder";
     longDescription = "Guetzli is a JPEG encoder that aims for excellent compression density at high visual quality.";
-    homepage = https://github.com/google/guetzli;
+    homepage = "https://github.com/google/guetzli";
     license = stdenv.lib.licenses.asl20;
     platforms = stdenv.lib.platforms.x86_64;
     maintainers = [ stdenv.lib.maintainers.seppeljordan ];
diff --git a/pkgs/applications/graphics/hugin/default.nix b/pkgs/applications/graphics/hugin/default.nix
index 8f7800a7323a6..7314ff893b00d 100644
--- a/pkgs/applications/graphics/hugin/default.nix
+++ b/pkgs/applications/graphics/hugin/default.nix
@@ -46,7 +46,7 @@ stdenv.mkDerivation rec {
   '';
 
   meta = with stdenv.lib; {
-    homepage = http://hugin.sourceforge.net/;
+    homepage = "http://hugin.sourceforge.net/";
     description = "Toolkit for stitching photographs and assembling panoramas, together with an easy to use graphical front end";
     license = licenses.gpl2Plus;
     maintainers = with maintainers; [ hrdinka ];
diff --git a/pkgs/applications/graphics/ideogram/default.nix b/pkgs/applications/graphics/ideogram/default.nix
index 3e17a045ecc11..4bf414cf8dd5d 100644
--- a/pkgs/applications/graphics/ideogram/default.nix
+++ b/pkgs/applications/graphics/ideogram/default.nix
@@ -58,7 +58,7 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     description = "Insert emoji anywhere, even in non-native apps - designed for elementary OS";
-    homepage = https://github.com/cassidyjames/ideogram;
+    homepage = "https://github.com/cassidyjames/ideogram";
     license = licenses.gpl2Plus;
     maintainers = pantheon.maintainers;
     platforms = platforms.linux;
diff --git a/pkgs/applications/graphics/image_optim/default.nix b/pkgs/applications/graphics/image_optim/default.nix
index 385f9825e46f7..ba437eab4122e 100644
--- a/pkgs/applications/graphics/image_optim/default.nix
+++ b/pkgs/applications/graphics/image_optim/default.nix
@@ -58,7 +58,7 @@ bundlerApp {
 
   meta = with lib; {
     description = "Command line tool and ruby interface to optimize (lossless compress, optionally lossy) jpeg, png, gif and svg images using external utilities (advpng, gifsicle, jhead, jpeg-recompress, jpegoptim, jpegrescan, jpegtran, optipng, pngcrush, pngout, pngquant, svgo)";
-    homepage    = https://github.com/toy/image_optim;
+    homepage    = "https://github.com/toy/image_optim";
     license     = licenses.mit;
     maintainers = with maintainers; [ srghma nicknovitski ];
     platforms   = platforms.all;
diff --git a/pkgs/applications/graphics/imagej/default.nix b/pkgs/applications/graphics/imagej/default.nix
index 6472712bcb400..d47369f5094a0 100644
--- a/pkgs/applications/graphics/imagej/default.nix
+++ b/pkgs/applications/graphics/imagej/default.nix
@@ -32,7 +32,7 @@ let
         --add-flags "-jar $out/share/java/ij.jar -ijpath $out/share"
     '';
     meta = with stdenv.lib; {
-      homepage = https://imagej.nih.gov/ij/;
+      homepage = "https://imagej.nih.gov/ij/";
       description = "Image processing and analysis in Java";
       longDescription = ''
         ImageJ is a public domain Java image processing program
diff --git a/pkgs/applications/graphics/imgcat/default.nix b/pkgs/applications/graphics/imgcat/default.nix
index 1fa3ec8ccc689..5943632930c57 100644
--- a/pkgs/applications/graphics/imgcat/default.nix
+++ b/pkgs/applications/graphics/imgcat/default.nix
@@ -25,7 +25,7 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     description = "It's like cat, but for images";
-    homepage = https://github.com/eddieantonio/imgcat;
+    homepage = "https://github.com/eddieantonio/imgcat";
     license = licenses.isc;
     maintainers = with maintainers; [ jwiegley ];
     platforms = platforms.unix;
diff --git a/pkgs/applications/graphics/imlibsetroot/default.nix b/pkgs/applications/graphics/imlibsetroot/default.nix
index 8ca4d71bb56cd..06549468efe98 100644
--- a/pkgs/applications/graphics/imlibsetroot/default.nix
+++ b/pkgs/applications/graphics/imlibsetroot/default.nix
@@ -21,7 +21,7 @@ stdenv.mkDerivation {
 
   meta = with stdenv.lib; {
     description = "A Xinerama Aware Background Changer";
-    homepage = http://robotmonkeys.net/2010/03/30/imlibsetroot/;
+    homepage = "http://robotmonkeys.net/2010/03/30/imlibsetroot/";
     license = licenses.gpl2;
     platforms = platforms.linux;
     maintainers = with maintainers; [ dwarfmaster ];
diff --git a/pkgs/applications/graphics/imv/default.nix b/pkgs/applications/graphics/imv/default.nix
index 26a6cabf7841f..88b4a8476658d 100644
--- a/pkgs/applications/graphics/imv/default.nix
+++ b/pkgs/applications/graphics/imv/default.nix
@@ -53,7 +53,7 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     description = "A command line image viewer for tiling window managers";
-    homepage    = https://github.com/eXeC64/imv;
+    homepage    = "https://github.com/eXeC64/imv";
     license     = licenses.gpl2;
     maintainers = with maintainers; [ rnhmjoj markus1189 ];
     platforms   = [ "i686-linux" "x86_64-linux" ];
diff --git a/pkgs/applications/graphics/inkscape/default.nix b/pkgs/applications/graphics/inkscape/default.nix
index 3996b94ba14df..763c9f4db220e 100644
--- a/pkgs/applications/graphics/inkscape/default.nix
+++ b/pkgs/applications/graphics/inkscape/default.nix
@@ -83,7 +83,7 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     license = "GPL";
-    homepage = https://www.inkscape.org;
+    homepage = "https://www.inkscape.org";
     description = "Vector graphics editor";
     platforms = platforms.all;
     longDescription = ''
diff --git a/pkgs/applications/graphics/ipe/default.nix b/pkgs/applications/graphics/ipe/default.nix
index 0cb09ecb6430d..c6cf71cc67bc9 100644
--- a/pkgs/applications/graphics/ipe/default.nix
+++ b/pkgs/applications/graphics/ipe/default.nix
@@ -34,7 +34,7 @@ stdenv.mkDerivation rec {
 
   meta = {
     description = "An editor for drawing figures";
-    homepage = http://ipe.otfried.org;
+    homepage = "http://ipe.otfried.org";
     license = stdenv.lib.licenses.gpl3Plus;
     longDescription = ''
       Ipe is an extensible drawing editor for creating figures in PDF and Postscript format.
diff --git a/pkgs/applications/graphics/jpegoptim/default.nix b/pkgs/applications/graphics/jpegoptim/default.nix
index cc1ca3a0ff2a2..265ce82b8ac3f 100644
--- a/pkgs/applications/graphics/jpegoptim/default.nix
+++ b/pkgs/applications/graphics/jpegoptim/default.nix
@@ -16,7 +16,7 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     description = "Optimize JPEG files";
-    homepage = https://www.kokkonen.net/tjko/projects.html ;
+    homepage = "https://www.kokkonen.net/tjko/projects.html";
     license = licenses.gpl2;
     maintainers = [ maintainers.aristid ];
     platforms = platforms.all;
diff --git a/pkgs/applications/graphics/jpegrescan/default.nix b/pkgs/applications/graphics/jpegrescan/default.nix
index 1c65c7da3a284..5fe35edabdf6f 100644
--- a/pkgs/applications/graphics/jpegrescan/default.nix
+++ b/pkgs/applications/graphics/jpegrescan/default.nix
@@ -34,7 +34,7 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     description = "losslessly shrink any JPEG file";
-    homepage = https://github.com/kud/jpegrescan;
+    homepage = "https://github.com/kud/jpegrescan";
     license = licenses.publicDomain;
     maintainers = [ maintainers.ramkromberg ];
     platforms = platforms.all;
diff --git a/pkgs/applications/graphics/k3d/default.nix b/pkgs/applications/graphics/k3d/default.nix
index 31085cd8023dc..c74f35e4334af 100644
--- a/pkgs/applications/graphics/k3d/default.nix
+++ b/pkgs/applications/graphics/k3d/default.nix
@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
 
   patches = [
     (fetchpatch { /* glibmm 2.50 fix */
-      url = https://github.com/K-3D/k3d/commit/c65889d0652490d88a573e47de7a9324bf27bff2.patch;
+      url = "https://github.com/K-3D/k3d/commit/c65889d0652490d88a573e47de7a9324bf27bff2.patch";
       sha256 = "162icv1hicr2dirkb9ijacvg9bhz5j30yfwg7b45ijavk8rns62j";
     })
   ];
@@ -43,7 +43,7 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     description = "A 3D editor with support for procedural editing";
-    homepage = http://www.k-3d.org/;
+    homepage = "http://www.k-3d.org/";
     platforms = platforms.linux;
     maintainers = [ maintainers.raskin ];
     license = licenses.gpl2;
diff --git a/pkgs/applications/graphics/krita/default.nix b/pkgs/applications/graphics/krita/default.nix
index 3cc4834d756e4..3f7eb84ed8318 100644
--- a/pkgs/applications/graphics/krita/default.nix
+++ b/pkgs/applications/graphics/krita/default.nix
@@ -45,7 +45,7 @@ mkDerivation rec {
 
   meta = with lib; {
     description = "A free and open source painting application";
-    homepage = https://krita.org/;
+    homepage = "https://krita.org/";
     maintainers = with maintainers; [ abbradar ];
     platforms = platforms.linux;
     license = licenses.gpl2;
diff --git a/pkgs/applications/graphics/krop/default.nix b/pkgs/applications/graphics/krop/default.nix
index 401e5f6fc570b..818fc63535ed8 100644
--- a/pkgs/applications/graphics/krop/default.nix
+++ b/pkgs/applications/graphics/krop/default.nix
@@ -28,7 +28,7 @@ python3Packages.buildPythonApplication rec {
   doCheck = false;
 
   meta = {
-    homepage = http://arminstraub.com/software/krop;
+    homepage = "http://arminstraub.com/software/krop";
     description = "Graphical tool to crop the pages of PDF files";
     longDescription = ''
     Krop is a tool that allows you to optimise your PDF files, and remove
diff --git a/pkgs/applications/graphics/leocad/default.nix b/pkgs/applications/graphics/leocad/default.nix
index 201a4fe113e3b..5e950eeac04ba 100644
--- a/pkgs/applications/graphics/leocad/default.nix
+++ b/pkgs/applications/graphics/leocad/default.nix
@@ -24,7 +24,7 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     description = "CAD program for creating virtual LEGO models";
-    homepage = https://www.leocad.org/;
+    homepage = "https://www.leocad.org/";
     license = licenses.gpl2;
     platforms = platforms.linux;
   };
diff --git a/pkgs/applications/graphics/luminance-hdr/default.nix b/pkgs/applications/graphics/luminance-hdr/default.nix
index 94899c937a86b..3359365cff1b1 100644
--- a/pkgs/applications/graphics/luminance-hdr/default.nix
+++ b/pkgs/applications/graphics/luminance-hdr/default.nix
@@ -24,7 +24,7 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ cmake pkgconfig ];
 
   meta = with stdenv.lib; {
-    homepage = http://qtpfsgui.sourceforge.net/;
+    homepage = "http://qtpfsgui.sourceforge.net/";
     description = "A complete open source solution for HDR photography";
     license = licenses.gpl2;
     platforms = platforms.linux;
diff --git a/pkgs/applications/graphics/meh/default.nix b/pkgs/applications/graphics/meh/default.nix
index 7ad8c388a203b..0b2e5bc377747 100644
--- a/pkgs/applications/graphics/meh/default.nix
+++ b/pkgs/applications/graphics/meh/default.nix
@@ -20,7 +20,7 @@ stdenv.mkDerivation {
 
   meta = {
     description = "A minimal image viewer using raw XLib";
-    homepage = https://www.johnhawthorn.com/meh/;
+    homepage = "https://www.johnhawthorn.com/meh/";
     license = stdenv.lib.licenses.mit;
     platforms = stdenv.lib.platforms.linux;
   };
diff --git a/pkgs/applications/graphics/meshlab/default.nix b/pkgs/applications/graphics/meshlab/default.nix
index 9733f1e2efa07..6ac937dcb931f 100644
--- a/pkgs/applications/graphics/meshlab/default.nix
+++ b/pkgs/applications/graphics/meshlab/default.nix
@@ -126,7 +126,7 @@ in mkDerivation {
 
   meta = {
     description = "A system for processing and editing 3D triangular meshes.";
-    homepage = http://www.meshlab.net/;
+    homepage = "http://www.meshlab.net/";
     license = lib.licenses.gpl3;
     maintainers = with lib.maintainers; [viric];
     platforms = with lib.platforms; linux;
diff --git a/pkgs/applications/graphics/minidjvu/default.nix b/pkgs/applications/graphics/minidjvu/default.nix
index d629c776194d9..2af79659cedb2 100644
--- a/pkgs/applications/graphics/minidjvu/default.nix
+++ b/pkgs/applications/graphics/minidjvu/default.nix
@@ -3,7 +3,7 @@
 stdenv.mkDerivation {
   name = "minidjvu-0.8";
   src = fetchurl {
-    url = mirror://sourceforge/minidjvu/minidjvu-0.8.tar.gz;
+    url = "mirror://sourceforge/minidjvu/minidjvu-0.8.tar.gz";
     sha256 = "0jmpvy4g68k6xgplj9zsl6brg6vi81mx3nx2x9hfbr1f4zh95j79";
   };
 
@@ -18,7 +18,7 @@ stdenv.mkDerivation {
   '';
 
   meta = {
-    homepage = http://djvu.sourceforge.net/djview4.html;
+    homepage = "http://djvu.sourceforge.net/djview4.html";
     description = "Black-and-white djvu page encoder and decoder that use interpage information";
     license = stdenv.lib.licenses.gpl2Plus;
     maintainers = [ stdenv.lib.maintainers.viric ];
diff --git a/pkgs/applications/graphics/mozjpeg/default.nix b/pkgs/applications/graphics/mozjpeg/default.nix
index 63cc4a3a8d359..e17664a018ab7 100644
--- a/pkgs/applications/graphics/mozjpeg/default.nix
+++ b/pkgs/applications/graphics/mozjpeg/default.nix
@@ -22,7 +22,7 @@ stdenv.mkDerivation rec {
 
       The idea is to reduce transfer times for JPEGs on the Web, thus reducing page load times.
     '';
-    homepage = https://github.com/mozilla/mozjpeg ;
+    homepage = "https://github.com/mozilla/mozjpeg";
     license = stdenv.lib.licenses.bsd3;
     maintainers = [ stdenv.lib.maintainers.aristid ];
     platforms = stdenv.lib.platforms.all;
diff --git a/pkgs/applications/graphics/mtpaint/default.nix b/pkgs/applications/graphics/mtpaint/default.nix
index 7274bdacd9d04..91278c9881fef 100644
--- a/pkgs/applications/graphics/mtpaint/default.nix
+++ b/pkgs/applications/graphics/mtpaint/default.nix
@@ -32,7 +32,7 @@ stdenv.mkDerivation rec {
       Due to its simplicity and lack of dependencies it runs well on
       GNU/Linux, Windows and older PC hardware.
     '';
-    homepage = http://mtpaint.sourceforge.net/;
+    homepage = "http://mtpaint.sourceforge.net/";
     license = stdenv.lib.licenses.gpl3;
     platforms = stdenv.lib.platforms.linux;
     maintainers = [ stdenv.lib.maintainers.vklquevs ];
diff --git a/pkgs/applications/graphics/nomacs/default.nix b/pkgs/applications/graphics/nomacs/default.nix
index 48a79e8844e85..f0d9329bc5a9f 100644
--- a/pkgs/applications/graphics/nomacs/default.nix
+++ b/pkgs/applications/graphics/nomacs/default.nix
@@ -63,11 +63,11 @@ mkDerivation rec {
                 "-DUSE_SYSTEM_QUAZIP=ON"];
 
   meta = with stdenv.lib; {
-    homepage = https://nomacs.org;
+    homepage = "https://nomacs.org";
     description = "Qt-based image viewer";
     maintainers = [maintainers.ahmedtd];
     license = licenses.gpl3Plus;
-    repositories.git = https://github.com/nomacs/nomacs.git;
+    repositories.git = "https://github.com/nomacs/nomacs.git";
     inherit (qtbase.meta) platforms;
   };
 }
diff --git a/pkgs/applications/graphics/openimageio/2.x.nix b/pkgs/applications/graphics/openimageio/2.x.nix
index 9c4a8b229391d..89d49a1514577 100644
--- a/pkgs/applications/graphics/openimageio/2.x.nix
+++ b/pkgs/applications/graphics/openimageio/2.x.nix
@@ -57,7 +57,7 @@ stdenv.mkDerivation rec {
   ];
 
   meta = with stdenv.lib; {
-    homepage = http://www.openimageio.org;
+    homepage = "http://www.openimageio.org";
     description = "A library and tools for reading and writing images";
     license = licenses.bsd3;
     maintainers = with maintainers; [ goibhniu jtojnar ];
diff --git a/pkgs/applications/graphics/openimageio/default.nix b/pkgs/applications/graphics/openimageio/default.nix
index 23cad7e859df1..1f2861e7109c9 100644
--- a/pkgs/applications/graphics/openimageio/default.nix
+++ b/pkgs/applications/graphics/openimageio/default.nix
@@ -34,7 +34,7 @@ stdenv.mkDerivation rec {
   ];
 
   meta = with stdenv.lib; {
-    homepage = http://www.openimageio.org;
+    homepage = "http://www.openimageio.org";
     description = "A library and tools for reading and writing images";
     license = licenses.bsd3;
     maintainers = [ maintainers.goibhniu ];
diff --git a/pkgs/applications/graphics/openscad/default.nix b/pkgs/applications/graphics/openscad/default.nix
index 2c95f6d403f2c..95af658ddd36b 100644
--- a/pkgs/applications/graphics/openscad/default.nix
+++ b/pkgs/applications/graphics/openscad/default.nix
@@ -77,7 +77,7 @@ mkDerivation rec {
       machine parts but pretty sure is not what you are looking for when you are more
       interested in creating computer-animated movies.
     '';
-    homepage = http://openscad.org/;
+    homepage = "http://openscad.org/";
     license = stdenv.lib.licenses.gpl2;
     platforms = stdenv.lib.platforms.unix;
     maintainers = with stdenv.lib.maintainers;
diff --git a/pkgs/applications/graphics/panotools/default.nix b/pkgs/applications/graphics/panotools/default.nix
index 719aca5096a58..c03bdd8331be8 100644
--- a/pkgs/applications/graphics/panotools/default.nix
+++ b/pkgs/applications/graphics/panotools/default.nix
@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
   #doCheck = true;
 
   meta = {
-    homepage = http://panotools.sourceforge.net/;
+    homepage = "http://panotools.sourceforge.net/";
     description = "Free software suite for authoring and displaying virtual reality panoramas";
     license = stdenv.lib.licenses.gpl2Plus;
 
diff --git a/pkgs/applications/graphics/paraview/default.nix b/pkgs/applications/graphics/paraview/default.nix
index ac01c28ebd4bf..15d70d1430812 100644
--- a/pkgs/applications/graphics/paraview/default.nix
+++ b/pkgs/applications/graphics/paraview/default.nix
@@ -59,7 +59,7 @@ mkDerivation rec {
   '';
 
   meta = with stdenv.lib; {
-    homepage = http://www.paraview.org/;
+    homepage = "http://www.paraview.org/";
     description = "3D Data analysis and visualization application";
     license = licenses.free;
     maintainers = with maintainers; [ guibert ];
diff --git a/pkgs/applications/graphics/pbrt/default.nix b/pkgs/applications/graphics/pbrt/default.nix
index 78f6d8bcbaff8..fa3034cb3b074 100644
--- a/pkgs/applications/graphics/pbrt/default.nix
+++ b/pkgs/applications/graphics/pbrt/default.nix
@@ -21,7 +21,7 @@ stdenv.mkDerivation {
   buildInputs = [ git flex bison cmake zlib ];
 
   meta = with stdenv.lib; {
-    homepage = http://pbrt.org;
+    homepage = "http://pbrt.org";
     description = "The renderer described in the third edition of the book 'Physically Based Rendering: From Theory To Implementation'";
     platforms = platforms.linux ;
     license = licenses.bsd2;
diff --git a/pkgs/applications/graphics/pdfcpu/default.nix b/pkgs/applications/graphics/pdfcpu/default.nix
index f31506ce73398..b127be821c139 100644
--- a/pkgs/applications/graphics/pdfcpu/default.nix
+++ b/pkgs/applications/graphics/pdfcpu/default.nix
@@ -17,7 +17,7 @@ buildGoModule rec {
 
   meta = with stdenv.lib; {
     description = "A PDF processor written in Go";
-    homepage = https://pdfcpu.io;
+    homepage = "https://pdfcpu.io";
     license = licenses.asl20;
     maintainers = with maintainers; [ doronbehar ];
     platforms = platforms.all;
diff --git a/pkgs/applications/graphics/photoflow/default.nix b/pkgs/applications/graphics/photoflow/default.nix
index 78d16e6922611..9fec8b99c1bd0 100644
--- a/pkgs/applications/graphics/photoflow/default.nix
+++ b/pkgs/applications/graphics/photoflow/default.nix
@@ -47,7 +47,7 @@ stdenv.mkDerivation {
 
   meta = with stdenv.lib; {
     description = "A fully non-destructive photo retouching program providing a complete RAW image editing workflow";
-    homepage = https://aferrero2707.github.io/PhotoFlow/;
+    homepage = "https://aferrero2707.github.io/PhotoFlow/";
     license = licenses.gpl3Plus;
     maintainers = [ maintainers.MtP ];
     platforms = platforms.linux;
diff --git a/pkgs/applications/graphics/photoqt/default.nix b/pkgs/applications/graphics/photoqt/default.nix
index 14c49d30004c5..71c63bc82aa23 100644
--- a/pkgs/applications/graphics/photoqt/default.nix
+++ b/pkgs/applications/graphics/photoqt/default.nix
@@ -40,7 +40,7 @@ mkDerivation rec {
   enableParallelBuilding = true;
 
   meta = {
-    homepage = https://photoqt.org/;
+    homepage = "https://photoqt.org/";
     description = "Simple, yet powerful and good looking image viewer";
     license = stdenv.lib.licenses.gpl2Plus;
     platforms = stdenv.lib.platforms.unix;
diff --git a/pkgs/applications/graphics/phototonic/default.nix b/pkgs/applications/graphics/phototonic/default.nix
index 5e7fb5cf7a0a8..1c6c1b4335477 100644
--- a/pkgs/applications/graphics/phototonic/default.nix
+++ b/pkgs/applications/graphics/phototonic/default.nix
@@ -20,7 +20,7 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     description = "An image viewer and organizer";
-    homepage = https://sourceforge.net/projects/phototonic/;
+    homepage = "https://sourceforge.net/projects/phototonic/";
     license = licenses.gpl3;
     platforms = platforms.linux;
     maintainers = with maintainers; [ pSub ];
diff --git a/pkgs/applications/graphics/pinta/default.nix b/pkgs/applications/graphics/pinta/default.nix
index 1409037668489..af51c78a1698d 100644
--- a/pkgs/applications/graphics/pinta/default.nix
+++ b/pkgs/applications/graphics/pinta/default.nix
@@ -74,7 +74,7 @@ buildDotnetPackage rec {
   '';
 
   meta = {
-    homepage = http://www.pinta-project.com/;
+    homepage = "http://www.pinta-project.com/";
     description = "Drawing/editing program modeled after Paint.NET";
     license = stdenv.lib.licenses.mit;
     maintainers = with stdenv.lib.maintainers; [ ];
diff --git a/pkgs/applications/graphics/potrace/default.nix b/pkgs/applications/graphics/potrace/default.nix
index 35ab27bcbf638..dd8e84349fad8 100644
--- a/pkgs/applications/graphics/potrace/default.nix
+++ b/pkgs/applications/graphics/potrace/default.nix
@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
   doCheck = true;
 
   meta = with stdenv.lib; {
-    homepage = http://potrace.sourceforge.net/;
+    homepage = "http://potrace.sourceforge.net/";
     description = "A tool for tracing a bitmap, which means, transforming a bitmap into a smooth, scalable image";
     platforms = platforms.unix;
     maintainers = [ maintainers.pSub ];
diff --git a/pkgs/applications/graphics/pqiv/default.nix b/pkgs/applications/graphics/pqiv/default.nix
index 7639a2a9c7612..505f28a24510a 100644
--- a/pkgs/applications/graphics/pqiv/default.nix
+++ b/pkgs/applications/graphics/pqiv/default.nix
@@ -20,7 +20,7 @@ stdenv.mkDerivation (rec {
 
   meta = with stdenv.lib; {
     description = "Powerful image viewer with minimal UI";
-    homepage = http://www.pberndt.com/Programme/Linux/pqiv;
+    homepage = "http://www.pberndt.com/Programme/Linux/pqiv";
     license = licenses.gpl3;
     maintainers = [];
     platforms = platforms.linux;
diff --git a/pkgs/applications/graphics/processing/default.nix b/pkgs/applications/graphics/processing/default.nix
index 9972ea7570982..cad6a35ce3f6b 100644
--- a/pkgs/applications/graphics/processing/default.nix
+++ b/pkgs/applications/graphics/processing/default.nix
@@ -22,7 +22,7 @@ stdenv.mkDerivation rec {
     # do not download a file during build
     ${xmlstarlet}/bin/xmlstarlet ed --inplace -P -d '//get[@src="http://download.processing.org/reference.zip"]' build/build.xml
     install -D -m0444 ${fetchurl {
-                          url    = http://download.processing.org/reference.zip;
+                          url    = "http://download.processing.org/reference.zip";
                           sha256 = "198bpk8mzns6w5h0zdf50wr6iv7sgdi6v7jznj5rbsnpgyilxz35";
                         }
                        } ./java/reference.zip
@@ -56,7 +56,7 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     description = "A language and IDE for electronic arts";
-    homepage = https://processing.org;
+    homepage = "https://processing.org";
     license = licenses.gpl2Plus;
     platforms = platforms.linux;
   };
diff --git a/pkgs/applications/graphics/qcomicbook/default.nix b/pkgs/applications/graphics/qcomicbook/default.nix
index 4d416a7c106d2..4f7e5b931f47b 100644
--- a/pkgs/applications/graphics/qcomicbook/default.nix
+++ b/pkgs/applications/graphics/qcomicbook/default.nix
@@ -25,7 +25,7 @@ stdenv.mkDerivation rec {
   '';
 
   meta = with stdenv.lib; {
-    homepage = https://github.com/stolowski/QComicBook;
+    homepage = "https://github.com/stolowski/QComicBook";
     description = "Comic book reader in Qt5";
     license = licenses.gpl2;
 
diff --git a/pkgs/applications/graphics/qiv/default.nix b/pkgs/applications/graphics/qiv/default.nix
index 750217d99188c..d3dd917d7b7dd 100644
--- a/pkgs/applications/graphics/qiv/default.nix
+++ b/pkgs/applications/graphics/qiv/default.nix
@@ -20,7 +20,7 @@ stdenv.mkDerivation (rec {
 
   meta = with stdenv.lib; {
     description = "Quick image viewer";
-    homepage = http://spiegl.de/qiv/;
+    homepage = "http://spiegl.de/qiv/";
     inherit version;
     license = licenses.gpl2;
     platforms = platforms.linux;
diff --git a/pkgs/applications/graphics/qscreenshot/default.nix b/pkgs/applications/graphics/qscreenshot/default.nix
index fafc76a76ffeb..1653ea9272062 100644
--- a/pkgs/applications/graphics/qscreenshot/default.nix
+++ b/pkgs/applications/graphics/qscreenshot/default.nix
@@ -19,7 +19,7 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     description = "Simple creation and editing of screenshots";
-    homepage = https://sourceforge.net/projects/qscreenshot/;
+    homepage = "https://sourceforge.net/projects/qscreenshot/";
     license = licenses.gpl2;
     platforms = platforms.all;
     maintainers = [ maintainers.bjornfor ];
diff --git a/pkgs/applications/graphics/rapid-photo-downloader/default.nix b/pkgs/applications/graphics/rapid-photo-downloader/default.nix
index afdd2262e504f..aa6db0accdba8 100644
--- a/pkgs/applications/graphics/rapid-photo-downloader/default.nix
+++ b/pkgs/applications/graphics/rapid-photo-downloader/default.nix
@@ -80,7 +80,7 @@ mkDerivationWith python3Packages.buildPythonApplication rec {
 
   meta = with stdenv.lib; {
     description = "Photo and video importer for cameras, phones, and memory cards";
-    homepage = https://www.damonlynch.net/rapid/;
+    homepage = "https://www.damonlynch.net/rapid/";
     license = licenses.gpl3;
     platforms = platforms.linux;
     maintainers = with maintainers; [ jfrankenau ];
diff --git a/pkgs/applications/graphics/rawtherapee/default.nix b/pkgs/applications/graphics/rawtherapee/default.nix
index 3f89b7f8b3a36..812c26f56e596 100644
--- a/pkgs/applications/graphics/rawtherapee/default.nix
+++ b/pkgs/applications/graphics/rawtherapee/default.nix
@@ -36,7 +36,7 @@ stdenv.mkDerivation rec {
 
   meta = {
     description = "RAW converter and digital photo processing software";
-    homepage = http://www.rawtherapee.com/;
+    homepage = "http://www.rawtherapee.com/";
     license = stdenv.lib.licenses.gpl3Plus;
     maintainers = with stdenv.lib.maintainers; [ jcumming mahe the-kenny ];
     platforms = with stdenv.lib.platforms; linux;
diff --git a/pkgs/applications/graphics/renderdoc/default.nix b/pkgs/applications/graphics/renderdoc/default.nix
index e345fcce01e34..bf0b92b6f6d45 100644
--- a/pkgs/applications/graphics/renderdoc/default.nix
+++ b/pkgs/applications/graphics/renderdoc/default.nix
@@ -65,7 +65,7 @@ mkDerivation rec {
 
   meta = with stdenv.lib; {
     description = "A single-frame graphics debugger";
-    homepage = https://renderdoc.org/;
+    homepage = "https://renderdoc.org/";
     license = licenses.mit;
     longDescription = ''
       RenderDoc is a free MIT licensed stand-alone graphics debugger that
diff --git a/pkgs/applications/graphics/runwayml/default.nix b/pkgs/applications/graphics/runwayml/default.nix
index c3f747837e01d..eb8ecc34b8f35 100644
--- a/pkgs/applications/graphics/runwayml/default.nix
+++ b/pkgs/applications/graphics/runwayml/default.nix
@@ -37,7 +37,7 @@ in
 
   meta = with lib; {
     description = "Machine learning for creators";
-    homepage = https://runwayml.com/;
+    homepage = "https://runwayml.com/";
     license = licenses.unfree;
     maintainers = with maintainers; [ prusnak ];
     platforms = [ "x86_64-linux" ];
diff --git a/pkgs/applications/graphics/sane/backends/brscan4/default.nix b/pkgs/applications/graphics/sane/backends/brscan4/default.nix
index cd75088ea53c8..22e8a2ca53607 100644
--- a/pkgs/applications/graphics/sane/backends/brscan4/default.nix
+++ b/pkgs/applications/graphics/sane/backends/brscan4/default.nix
@@ -86,7 +86,7 @@ in stdenv.mkDerivation rec {
 
   meta = {
     description = "Brother brscan4 sane backend driver";
-    homepage = http://www.brother.com;
+    homepage = "http://www.brother.com";
     platforms = stdenv.lib.platforms.linux;
     license = stdenv.lib.licenses.unfree;
     maintainers = with stdenv.lib.maintainers; [ jraygauthier ];
diff --git a/pkgs/applications/graphics/sane/backends/brscan4/udev_rules_type1.nix b/pkgs/applications/graphics/sane/backends/brscan4/udev_rules_type1.nix
index da136a7f9e1e6..682e401c069bd 100644
--- a/pkgs/applications/graphics/sane/backends/brscan4/udev_rules_type1.nix
+++ b/pkgs/applications/graphics/sane/backends/brscan4/udev_rules_type1.nix
@@ -47,7 +47,7 @@ stdenv.mkDerivation rec {
 
   meta = {
     description = "Brother type1 scanners udev rules";
-    homepage = http://www.brother.com;
+    homepage = "http://www.brother.com";
     platforms = stdenv.lib.platforms.linux;
     license = stdenv.lib.licenses.unfree;
     maintainers = with stdenv.lib.maintainers; [ jraygauthier ];
diff --git a/pkgs/applications/graphics/sane/backends/dsseries/default.nix b/pkgs/applications/graphics/sane/backends/dsseries/default.nix
index d4165be3784fd..37ac02987061e 100644
--- a/pkgs/applications/graphics/sane/backends/dsseries/default.nix
+++ b/pkgs/applications/graphics/sane/backends/dsseries/default.nix
@@ -45,7 +45,7 @@ stdenv.mkDerivation rec {
 
   meta = {
     description = "Brother DSSeries SANE backend driver";
-    homepage = http://www.brother.com;
+    homepage = "http://www.brother.com";
     platforms = stdenv.lib.platforms.linux;
     license = stdenv.lib.licenses.unfree;
     maintainers = with stdenv.lib.maintainers; [ callahad ];
diff --git a/pkgs/applications/graphics/sane/frontends.nix b/pkgs/applications/graphics/sane/frontends.nix
index b00f8f6c58d7c..188431bda6c64 100644
--- a/pkgs/applications/graphics/sane/frontends.nix
+++ b/pkgs/applications/graphics/sane/frontends.nix
@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     description = "Scanner Access Now Easy";
-    homepage    = http://www.sane-project.org/;
+    homepage    = "http://www.sane-project.org/";
     license     = licenses.gpl2Plus;
     maintainers = with maintainers; [ peti ];
     platforms   = platforms.linux;
diff --git a/pkgs/applications/graphics/sane/xsane.nix b/pkgs/applications/graphics/sane/xsane.nix
index 09b431fdb116c..22a8f4dc3bdae 100644
--- a/pkgs/applications/graphics/sane/xsane.nix
+++ b/pkgs/applications/graphics/sane/xsane.nix
@@ -24,7 +24,7 @@ stdenv.mkDerivation rec {
     ++ stdenv.lib.optional gimpSupport gimp;
 
   meta = {
-    homepage = http://www.sane-project.org/;
+    homepage = "http://www.sane-project.org/";
     description = "Graphical scanning frontend for sane";
     license = stdenv.lib.licenses.gpl2Plus;
     maintainers = with stdenv.lib.maintainers; [peti];
diff --git a/pkgs/applications/graphics/scantailor/advanced.nix b/pkgs/applications/graphics/scantailor/advanced.nix
index f9d6c87675f7b..e4598193469b8 100644
--- a/pkgs/applications/graphics/scantailor/advanced.nix
+++ b/pkgs/applications/graphics/scantailor/advanced.nix
@@ -17,7 +17,7 @@ mkDerivation rec {
   buildInputs = [ libjpeg libpng libtiff boost qtbase ];
 
   meta = with stdenv.lib; {
-    homepage = https://github.com/4lex4/scantailor-advanced;
+    homepage = "https://github.com/4lex4/scantailor-advanced";
     description = "Interactive post-processing tool for scanned pages";
     license = licenses.gpl3Plus;
     maintainers = with maintainers; [ jfrankenau ];
diff --git a/pkgs/applications/graphics/scantailor/default.nix b/pkgs/applications/graphics/scantailor/default.nix
index 14efe48f30dbe..bc54f3aa627a7 100644
--- a/pkgs/applications/graphics/scantailor/default.nix
+++ b/pkgs/applications/graphics/scantailor/default.nix
@@ -13,7 +13,7 @@ stdenv.mkDerivation {
   enableParallelBuilding = true;
 
   meta = {
-    homepage = http://scantailor.org/;
+    homepage = "http://scantailor.org/";
     description = "Interactive post-processing tool for scanned pages";
 
     license = stdenv.lib.licenses.gpl3Plus;
diff --git a/pkgs/applications/graphics/screencloud/default.nix b/pkgs/applications/graphics/screencloud/default.nix
index 88bbbd9d86462..11e37c4bf649d 100644
--- a/pkgs/applications/graphics/screencloud/default.nix
+++ b/pkgs/applications/graphics/screencloud/default.nix
@@ -68,7 +68,7 @@ stdenv.mkDerivation rec {
   '';
 
   meta = {
-    homepage = https://screencloud.net/;
+    homepage = "https://screencloud.net/";
     description = "Client for Screencloud, an easy to use screenshot sharing tool";
     license = stdenv.lib.licenses.gpl2;
     maintainers = with stdenv.lib.maintainers; [ forkk ];
diff --git a/pkgs/applications/graphics/shotwell/default.nix b/pkgs/applications/graphics/shotwell/default.nix
index f84986cb598ca..b03d0a01dd6f8 100644
--- a/pkgs/applications/graphics/shotwell/default.nix
+++ b/pkgs/applications/graphics/shotwell/default.nix
@@ -100,7 +100,7 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     description = "Popular photo organizer for the GNOME desktop";
-    homepage = https://wiki.gnome.org/Apps/Shotwell;
+    homepage = "https://wiki.gnome.org/Apps/Shotwell";
     license = licenses.lgpl21Plus;
     maintainers = with maintainers; [domenkozar];
     platforms = platforms.linux;
diff --git a/pkgs/applications/graphics/shutter/default.nix b/pkgs/applications/graphics/shutter/default.nix
index dd41ee4c3f845..cddc99eebe29e 100644
--- a/pkgs/applications/graphics/shutter/default.nix
+++ b/pkgs/applications/graphics/shutter/default.nix
@@ -38,7 +38,7 @@ stdenv.mkDerivation {
 
   meta = with stdenv.lib; {
     description = "Screenshot and annotation tool";
-    homepage = https://shutter-project.org/;
+    homepage = "https://shutter-project.org/";
     license = licenses.gpl3Plus;
     platforms = platforms.all;
     maintainers = [ maintainers.bjornfor ];
diff --git a/pkgs/applications/graphics/smartdeblur/default.nix b/pkgs/applications/graphics/smartdeblur/default.nix
index 314b4007aad50..0df161cd4731e 100644
--- a/pkgs/applications/graphics/smartdeblur/default.nix
+++ b/pkgs/applications/graphics/smartdeblur/default.nix
@@ -23,7 +23,7 @@ stdenv.mkDerivation rec {
   cmakeFlags = [ "-DUSE_SYSTEM_FFTW=ON" ];
 
   meta = {
-    homepage = https://github.com/Y-Vladimir/SmartDeblur;
+    homepage = "https://github.com/Y-Vladimir/SmartDeblur";
     description = "Tool for restoring blurry and defocused images";
     license = stdenv.lib.licenses.gpl3;
     maintainers = with stdenv.lib.maintainers; [ ];
diff --git a/pkgs/applications/graphics/solvespace/default.nix b/pkgs/applications/graphics/solvespace/default.nix
index 7046caad295e2..bd084b4287dc1 100644
--- a/pkgs/applications/graphics/solvespace/default.nix
+++ b/pkgs/applications/graphics/solvespace/default.nix
@@ -6,7 +6,7 @@ stdenv.mkDerivation rec {
   name = "solvespace-2.3-20190501";
   rev = "e7b75f19c34c923780db776592b47152650d8f22";
   src = fetchgit {
-    url = https://github.com/solvespace/solvespace;
+    url = "https://github.com/solvespace/solvespace";
     inherit rev;
     sha256 = "07k4mbzxf0dmzwdhjx5nc09y7rn1schkaypsw9kz0l7ppylprpp2";
     fetchSubmodules = true;
@@ -46,6 +46,6 @@ stdenv.mkDerivation rec {
     license = licenses.gpl3;
     maintainers = [ maintainers.edef ];
     platforms = platforms.linux;
-    homepage = http://solvespace.com;
+    homepage = "http://solvespace.com";
   };
 }
diff --git a/pkgs/applications/graphics/swingsane/default.nix b/pkgs/applications/graphics/swingsane/default.nix
index f56646e5aedd9..fc9132ec0b401 100644
--- a/pkgs/applications/graphics/swingsane/default.nix
+++ b/pkgs/applications/graphics/swingsane/default.nix
@@ -54,7 +54,7 @@ stdenv.mkDerivation rec {
       simultaneous scan jobs, image transformation jobs (deskew, binarize,
       crop, etc), PDF and PNG output.
     '';
-    homepage = http://swingsane.com/;
+    homepage = "http://swingsane.com/";
     license = licenses.asl20;
     platforms = platforms.all;
   };
diff --git a/pkgs/applications/graphics/sxiv/default.nix b/pkgs/applications/graphics/sxiv/default.nix
index f54299583286c..4cf0ae5557897 100644
--- a/pkgs/applications/graphics/sxiv/default.nix
+++ b/pkgs/applications/graphics/sxiv/default.nix
@@ -26,7 +26,7 @@ stdenv.mkDerivation rec {
 
   meta = {
     description = "Simple X Image Viewer";
-    homepage = https://github.com/muennich/sxiv;
+    homepage = "https://github.com/muennich/sxiv";
     license = stdenv.lib.licenses.gpl2Plus;
     platforms = stdenv.lib.platforms.linux;
     maintainers = with maintainers; [ jfrankenau ];
diff --git a/pkgs/applications/graphics/synfigstudio/default.nix b/pkgs/applications/graphics/synfigstudio/default.nix
index 188f7cb29343a..e2ffd16025857 100644
--- a/pkgs/applications/graphics/synfigstudio/default.nix
+++ b/pkgs/applications/graphics/synfigstudio/default.nix
@@ -119,7 +119,7 @@ stdenv.mkDerivation {
 
   meta = with stdenv.lib; {
     description = "A 2D animation program";
-    homepage = http://www.synfig.org;
+    homepage = "http://www.synfig.org";
     license = licenses.gpl2Plus;
     maintainers = [ maintainers.goibhniu ];
     platforms = platforms.linux;
diff --git a/pkgs/applications/graphics/tesseract/tesseract3.nix b/pkgs/applications/graphics/tesseract/tesseract3.nix
index 157c0b9742bfb..dc9d4ac2d595d 100644
--- a/pkgs/applications/graphics/tesseract/tesseract3.nix
+++ b/pkgs/applications/graphics/tesseract/tesseract3.nix
@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
 
   meta = {
     description = "OCR engine";
-    homepage = https://github.com/tesseract-ocr/tesseract;
+    homepage = "https://github.com/tesseract-ocr/tesseract";
     license = stdenv.lib.licenses.asl20;
     maintainers = with stdenv.lib.maintainers; [ viric earvstedt ];
     platforms = with stdenv.lib.platforms; linux ++ darwin;
diff --git a/pkgs/applications/graphics/tesseract/tesseract4.nix b/pkgs/applications/graphics/tesseract/tesseract4.nix
index 95896337720a8..d7c3cacc1f961 100644
--- a/pkgs/applications/graphics/tesseract/tesseract4.nix
+++ b/pkgs/applications/graphics/tesseract/tesseract4.nix
@@ -19,7 +19,7 @@ stdenv.mkDerivation rec {
 
   meta = {
     description = "OCR engine";
-    homepage = https://github.com/tesseract-ocr/tesseract;
+    homepage = "https://github.com/tesseract-ocr/tesseract";
     license = stdenv.lib.licenses.asl20;
     maintainers = with stdenv.lib.maintainers; [ viric earvstedt ];
     platforms = with stdenv.lib.platforms; linux ++ darwin;
diff --git a/pkgs/applications/graphics/timelapse-deflicker/default.nix b/pkgs/applications/graphics/timelapse-deflicker/default.nix
index 8355545e8dd6d..ac382bb632780 100644
--- a/pkgs/applications/graphics/timelapse-deflicker/default.nix
+++ b/pkgs/applications/graphics/timelapse-deflicker/default.nix
@@ -24,7 +24,7 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     description = "Simple script to deflicker images taken for timelapses";
-    homepage = https://github.com/cyberang3l/timelapse-deflicker;
+    homepage = "https://github.com/cyberang3l/timelapse-deflicker";
     license = licenses.gpl3;
     maintainers = with maintainers; [ valeriangalliat ];
     platforms = platforms.unix;
diff --git a/pkgs/applications/graphics/ufraw/default.nix b/pkgs/applications/graphics/ufraw/default.nix
index 131d83f0d58ea..9e05a41e84837 100644
--- a/pkgs/applications/graphics/ufraw/default.nix
+++ b/pkgs/applications/graphics/ufraw/default.nix
@@ -64,7 +64,7 @@ stdenv.mkDerivation {
   '';
 
   meta = with stdenv.lib; {
-    homepage = https://github.com/sergiomb2/ufraw;
+    homepage = "https://github.com/sergiomb2/ufraw";
 
     description = "Utility to read and manipulate raw images from digital cameras";
 
diff --git a/pkgs/applications/graphics/unigine-valley/default.nix b/pkgs/applications/graphics/unigine-valley/default.nix
index 09abfc60a5282..14ff5f9a519fa 100644
--- a/pkgs/applications/graphics/unigine-valley/default.nix
+++ b/pkgs/applications/graphics/unigine-valley/default.nix
@@ -107,7 +107,7 @@ in
 
     meta = {
       description = "The Unigine Valley GPU benchmarking tool";
-      homepage = http://unigine.com/products/benchmarks/valley/;
+      homepage = "http://unigine.com/products/benchmarks/valley/";
       license = stdenv.lib.licenses.unfree; # see also: $out/$instPath/documentation/License.pdf
       maintainers = [ stdenv.lib.maintainers.kierdavis ];
       platforms = ["x86_64-linux" "i686-linux"];
diff --git a/pkgs/applications/graphics/viewnior/default.nix b/pkgs/applications/graphics/viewnior/default.nix
index a80e89e72bcda..41463a7627ae7 100644
--- a/pkgs/applications/graphics/viewnior/default.nix
+++ b/pkgs/applications/graphics/viewnior/default.nix
@@ -30,7 +30,7 @@ stdenv.mkDerivation rec {
 
     license = stdenv.lib.licenses.gpl3;
 
-    homepage = http://siyanpanayotov.com/project/viewnior/;
+    homepage = "http://siyanpanayotov.com/project/viewnior/";
 
     maintainers = [ stdenv.lib.maintainers.smironov ];
 
diff --git a/pkgs/applications/graphics/vimiv/default.nix b/pkgs/applications/graphics/vimiv/default.nix
index fab85052df3b9..b5e9d0b8cf2dd 100644
--- a/pkgs/applications/graphics/vimiv/default.nix
+++ b/pkgs/applications/graphics/vimiv/default.nix
@@ -64,7 +64,7 @@ python3Packages.buildPythonApplication rec {
   postInstall = "make DESTDIR=\"$out\" install";
 
   meta = {
-    homepage = https://github.com/karlch/vimiv;
+    homepage = "https://github.com/karlch/vimiv";
     description = "An image viewer with Vim-like keybindings";
     license = lib.licenses.mit;
     platforms = lib.platforms.linux;
diff --git a/pkgs/applications/graphics/wings/default.nix b/pkgs/applications/graphics/wings/default.nix
index 8d6eca7ef32c5..19c30f3ecc4d1 100644
--- a/pkgs/applications/graphics/wings/default.nix
+++ b/pkgs/applications/graphics/wings/default.nix
@@ -36,7 +36,7 @@ stdenv.mkDerivation rec {
   '';
 
   meta = {
-    homepage = http://www.wings3d.com/;
+    homepage = "http://www.wings3d.com/";
     description = "Subdivision modeler inspired by Nendo and Mirai from Izware";
     license = stdenv.lib.licenses.tcltk;
     maintainers = with stdenv.lib.maintainers; [viric];
diff --git a/pkgs/applications/graphics/write_stylus/default.nix b/pkgs/applications/graphics/write_stylus/default.nix
index 0f1020b0b0784..b1bfbe3c4cf3d 100644
--- a/pkgs/applications/graphics/write_stylus/default.nix
+++ b/pkgs/applications/graphics/write_stylus/default.nix
@@ -54,7 +54,7 @@ stdenv.mkDerivation rec {
   '';
 
   meta = with stdenv.lib; {
-    homepage = http://www.styluslabs.com/;
+    homepage = "http://www.styluslabs.com/";
     description = "Write is a word processor for handwriting.";
     platforms = platforms.linux;
     license = stdenv.lib.licenses.unfree;
diff --git a/pkgs/applications/graphics/xaos/default.nix b/pkgs/applications/graphics/xaos/default.nix
index e80362c386b98..767f3aa920bfb 100644
--- a/pkgs/applications/graphics/xaos/default.nix
+++ b/pkgs/applications/graphics/xaos/default.nix
@@ -23,7 +23,7 @@ stdenv.mkDerivation rec {
   '';
 
   meta = {
-    homepage = http://xaos.sourceforge.net/;
+    homepage = "http://xaos.sourceforge.net/";
     description = "Fractal viewer";
     license = stdenv.lib.licenses.gpl2Plus;
     platforms = [ "x86_64-linux" ];
diff --git a/pkgs/applications/graphics/xara/default.nix b/pkgs/applications/graphics/xara/default.nix
index 56388a8a2555a..5e3c252435cd1 100644
--- a/pkgs/applications/graphics/xara/default.nix
+++ b/pkgs/applications/graphics/xara/default.nix
@@ -5,7 +5,7 @@ stdenv.mkDerivation {
   name = "xaralx-0.7r1785";
 
   src = fetchurl {
-    url = http://downloads2.xara.com/opensource/XaraLX-0.7r1785.tar.bz2;
+    url = "http://downloads2.xara.com/opensource/XaraLX-0.7r1785.tar.bz2";
     sha256 = "05xbzq1i1vw2mdsv7zjqfpxfv3g1j0g5kks0gq6sh373xd6y8lyh";
   };
 
diff --git a/pkgs/applications/graphics/xfractint/default.nix b/pkgs/applications/graphics/xfractint/default.nix
index ae4765fc9e769..8d36e4630dc57 100644
--- a/pkgs/applications/graphics/xfractint/default.nix
+++ b/pkgs/applications/graphics/xfractint/default.nix
@@ -24,6 +24,6 @@ stdenv.mkDerivation rec {
     license = stdenv.lib.licenses.unfree;
     maintainers = [stdenv.lib.maintainers.raskin];
     platforms = stdenv.lib.platforms.linux;
-    homepage = https://www.fractint.net/;
+    homepage = "https://www.fractint.net/";
   };
 }
diff --git a/pkgs/applications/graphics/xournal/default.nix b/pkgs/applications/graphics/xournal/default.nix
index 6d10a7cae231c..8a5d9c3597b83 100644
--- a/pkgs/applications/graphics/xournal/default.nix
+++ b/pkgs/applications/graphics/xournal/default.nix
@@ -56,7 +56,7 @@ stdenv.mkDerivation rec {
   '';
 
   meta = with stdenv.lib; {
-    homepage = http://xournal.sourceforge.net/;
+    homepage = "http://xournal.sourceforge.net/";
     description = "Note-taking application (supposes stylus)";
     maintainers = [ maintainers.guibert ];
     license = licenses.gpl2;
diff --git a/pkgs/applications/graphics/xzgv/default.nix b/pkgs/applications/graphics/xzgv/default.nix
index de3f3a78988b1..67f43faf99a30 100644
--- a/pkgs/applications/graphics/xzgv/default.nix
+++ b/pkgs/applications/graphics/xzgv/default.nix
@@ -19,7 +19,7 @@ stdenv.mkDerivation rec {
     mkdir -p $out/share/{app-install/desktop,applications,info,pixmaps}
   '';
   meta = with stdenv.lib; {
-    homepage = https://sourceforge.net/projects/xzgv/;
+    homepage = "https://sourceforge.net/projects/xzgv/";
     description = "Picture viewer for X with a thumbnail-based selector";
     license = licenses.gpl2;
     maintainers = [ maintainers.womfoo ];
diff --git a/pkgs/applications/graphics/zgv/default.nix b/pkgs/applications/graphics/zgv/default.nix
index 7b14d7750c3a3..6cc59a7e60bdd 100644
--- a/pkgs/applications/graphics/zgv/default.nix
+++ b/pkgs/applications/graphics/zgv/default.nix
@@ -19,7 +19,7 @@ stdenv.mkDerivation rec {
 
   patches = [
     (fetchpatch {
-    url = https://foss.aueb.gr/mirrors/linux/gentoo/media-gfx/zgv/files/zgv-5.9-libpng15.patch;
+    url = "https://foss.aueb.gr/mirrors/linux/gentoo/media-gfx/zgv/files/zgv-5.9-libpng15.patch";
     sha256 = "1blw9n04c28bnwcmcn64si4f5zpg42s8yn345js88fyzi9zm19xw";
     })
     ./switch.patch
@@ -33,7 +33,7 @@ stdenv.mkDerivation rec {
   '';
 
   meta = with stdenv.lib; {
-    homepage = http://www.svgalib.org/rus/zgv/;
+    homepage = "http://www.svgalib.org/rus/zgv/";
     description = "Picture viewer with a thumbnail-based selector";
     license = licenses.gpl2;
     maintainers = [ maintainers.vrthra ];