diff --git a/pkgs/development/tools/misc/unifdef/default.nix b/pkgs/development/tools/misc/unifdef/default.nix
index 6637c0e09bf..19dd907b73b 100644
--- a/pkgs/development/tools/misc/unifdef/default.nix
+++ b/pkgs/development/tools/misc/unifdef/default.nix
@@ -1,23 +1,24 @@
-{ stdenv, fetchFromGitHub }:
+{ fetchurl, stdenv }:
 
 stdenv.mkDerivation rec {
-  name = "unifdef-${version}";
-  version = "2.11";
+  name = "unifdef-2.6";
 
-  src = fetchFromGitHub {
-    owner = "fanf2";
-    repo = "unifdef";
-    rev = "8697cc11a1bb67c1153ecc556b880d1fdc4b4e00";
-    sha256 = "0d842m4zqbl5h8qiga1bp3vdirs01wd878rz0dkf32illkimmg0y";
+  src = fetchurl {
+    url    = "https://github.com/fanf2/unifdef/archive/${name}.tar.gz";
+    sha256 = "1p5wr5ms9w8kijy9h7qs1mz36dlavdj6ngz2bks588w7a20kcqxj";
   };
 
-  makeFlags = [
-    "prefix=$(out)"
-    "DESTDIR="
-  ];
+  postUnpack = ''
+    substituteInPlace $sourceRoot/unifdef.c \
+      --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; {