clean some include flags that weren't really needed

Tested the builds still work (x86_64-linux).

5 files changed, 7 insertions, 15 deletions

diff --git a/pkgs/development/compilers/swi-prolog/default.nix b/pkgs/development/compilers/swi-prolog/default.nix
index a17e104b5bbfd..e8db962d9c4fe 100644
--- a/pkgs/development/compilers/swi-prolog/default.nix
+++ b/pkgs/development/compilers/swi-prolog/default.nix
@@ -18,10 +18,6 @@ stdenv.mkDerivation {
   configureFlags = "--with-world --enable-gmp --enable-shared";
   makeFlags = "world";
 
-  preConfigure = ''
-    export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -I${freetype}/include/freetype2"
-  '';
-
   meta = {
     homepage = http://www.swi-prolog.org/;
     description = "A Prolog compiler and interpreter";
diff --git a/pkgs/development/libraries/cairo/default.nix b/pkgs/development/libraries/cairo/default.nix
index a09903f7ea91b..22e1ca0d6e4c9 100644
--- a/pkgs/development/libraries/cairo/default.nix
+++ b/pkgs/development/libraries/cairo/default.nix
@@ -34,8 +34,6 @@ stdenv.mkDerivation rec {
     ++ optional pdfSupport "--enable-pdf"
     ;
 
-  NIX_CFLAGS_COMPILE = "-I${pixman}/include/pixman-1";
-
   preConfigure =
   # On FreeBSD, `-ldl' doesn't exist.
     (stdenv.lib.optionalString stdenv.isFreeBSD
diff --git a/pkgs/development/libraries/glib/default.nix b/pkgs/development/libraries/glib/default.nix
index 6c53e573bf669..b2c5966c26797 100644
--- a/pkgs/development/libraries/glib/default.nix
+++ b/pkgs/development/libraries/glib/default.nix
@@ -12,15 +12,17 @@
 #       $out/bin/gtester-report' to postInstall if this is solved
 
 let
-  # some packages don't get "Cflags" from pkgconfig correctly
-  # and then fail to build when directly including like <glib/...>
+  # Some packages don't get "Cflags" from pkgconfig correctly
+  # and then fail to build when directly including like <glib/...>.
+  # This is intended to be run in postInstall of any package
+  # which has $out/include/ containing just some disjunct directories.
   flattenInclude = ''
-    for dir in $out/include/*; do
-      cp -r $dir/* "$out/include/"
+    for dir in "$out"/include/*; do
+      cp -r "$dir"/* "$out/include/"
       rm -r "$dir"
       ln -s . "$dir"
     done
-    ln -sr -t "$out/include/" $out/lib/*/include/* 2>/dev/null || true
+    ln -sr -t "$out/include/" "$out"/lib/*/include/* 2>/dev/null || true
   '';
 in
 with { inherit (stdenv.lib) optionalString; };
diff --git a/pkgs/development/libraries/pango/default.nix b/pkgs/development/libraries/pango/default.nix
index cec3d1dccc00e..b1faa6c30f62c 100644
--- a/pkgs/development/libraries/pango/default.nix
+++ b/pkgs/development/libraries/pango/default.nix
@@ -9,8 +9,6 @@ stdenv.mkDerivation rec {
     sha256 = "08aqis6j8nd1lb4f2h4h9d9kjvp54iwf8zvqzss0qn4v7nfcjyvx";
   };
 
-  NIX_CFLAGS_COMPILE = "-I${cairo}/include/cairo";
-
   buildInputs = stdenv.lib.optionals stdenv.isDarwin [ gettext fontconfig ];
 
   nativeBuildInputs = [ pkgconfig ];
diff --git a/pkgs/development/libraries/pangomm/2.28.x.nix b/pkgs/development/libraries/pangomm/2.28.x.nix
index d03aa4311fe01..6843ff7a3072d 100644
--- a/pkgs/development/libraries/pangomm/2.28.x.nix
+++ b/pkgs/development/libraries/pangomm/2.28.x.nix
@@ -11,8 +11,6 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ pkgconfig ];
   propagatedBuildInputs = [ pango glibmm cairomm libpng cairo ];
 
-  NIX_CFLAGS_COMPILE = "-I${cairo}/include/cairo";
-
   meta = with stdenv.lib; {
     description = "C++ interface to the Pango text rendering library";
     homepage    = http://www.pango.org/;