Revert "Merge pull request #16507 from vrthra/unifdef"

This reverts commit cab28503ad, reversing
changes made to 5313f1096a (but retaining
the meta updates).

The update to 2.11 breaks the darwin toolchain, see discussion at
https://github.com/NixOS/nixpkgs/pull/16507

Once the issues with 2.11 are worked out, this revert can be reverted.

pkgs/development/tools/misc/unifdef/default.nix

@@ -1,23 +1,24 @@
-{ stdenv, fetchFromGitHub }:
+{ fetchurl, stdenv }:
 
 stdenv.mkDerivation rec {
-  name = "unifdef-${version}";
+  name = "unifdef-2.6";
-  version = "2.11";
 
-  src = fetchFromGitHub {
+  src = fetchurl {
-    owner = "fanf2";
+    url    = "https://github.com/fanf2/unifdef/archive/${name}.tar.gz";
-    repo = "unifdef";
+    sha256 = "1p5wr5ms9w8kijy9h7qs1mz36dlavdj6ngz2bks588w7a20kcqxj";
-    rev = "8697cc11a1bb67c1153ecc556b880d1fdc4b4e00";
-    sha256 = "0d842m4zqbl5h8qiga1bp3vdirs01wd878rz0dkf32illkimmg0y";
   };
 
-  makeFlags = [
+  postUnpack = ''
-    "prefix=$(out)"
+    substituteInPlace $sourceRoot/unifdef.c \
-    "DESTDIR="
+      --replace '#include "version.h"' ""
-  ];
+
+    substituteInPlace $sourceRoot/Makefile \
+      --replace "unifdef.c: version.h" "unifdef.c:"
+  '';
 
   preBuild = ''
-  echo 'V="${name}"' > version.sh
+    unset HOME
+    export DESTDIR=$out
   '';
 
   meta = with stdenv.lib; {