3 files changed, 1 insertions, 7 deletions
diff --git a/pkgs/development/tools/parsing/flex/builder-new.sh b/pkgs/development/tools/parsing/flex/builder-new.sh
index dc78198f37dce..55947cd7e8c75 100755..100644
--- a/pkgs/development/tools/parsing/flex/builder-new.sh
+++ b/pkgs/development/tools/parsing/flex/builder-new.sh
@@ -1,5 +1,3 @@
-#! /bin/sh -e
-
 export buildinputs="$yacc $m4"
 . $stdenv/setup
 
diff --git a/pkgs/development/tools/parsing/flex/builder.sh b/pkgs/development/tools/parsing/flex/builder.sh
index 4c0975805508c..e032b03171514 100755..100644
--- a/pkgs/development/tools/parsing/flex/builder.sh
+++ b/pkgs/development/tools/parsing/flex/builder.sh
@@ -1,5 +1,3 @@
-#! /bin/sh
-
 export buildinputs="$yacc"
 . $stdenv/setup || exit 1
 
diff --git a/pkgs/development/tools/parsing/flex/default.nix b/pkgs/development/tools/parsing/flex/default.nix
index 3a4e3649e002d..b48a1d8621fab 100644
--- a/pkgs/development/tools/parsing/flex/default.nix
+++ b/pkgs/development/tools/parsing/flex/default.nix
@@ -1,13 +1,11 @@
 {stdenv, fetchurl, yacc}:
 assert yacc != null;
-derivation {
+stdenv.mkDerivation {
   name = "flex-2.5.4a";
-  system = stdenv.system;
   builder = ./builder.sh;
   src = fetchurl {
     url = ftp://ftp.nluug.nl/pub/gnu/flex/flex-2.5.4a.tar.gz;
     md5 = "bd8753d0b22e1f4ec87a553a73021adf";
   };
-  stdenv = stdenv;
   yacc = yacc;
 }