diff --git a/pkgs/games/warmux/default.nix b/pkgs/games/warmux/default.nix
index ad633d15a8c2..7bf277a7f9e2 100644
--- a/pkgs/games/warmux/default.nix
+++ b/pkgs/games/warmux/default.nix
@@ -1,55 +1,36 @@
-x@{builderDefsPackage
-  , zlib
-  , curl, gnutls, fribidi, libpng, SDL, SDL_gfx, SDL_image, SDL_mixer
-  , SDL_net, SDL_ttf, libunwind, libX11, xproto, libxml2, pkgconfig
-  , gettext, intltool, libtool, perl
-  , ...}:
-builderDefsPackage
-(a :  
-let 
-  helperArgNames = ["stdenv" "fetchurl" "builderDefsPackage"] ++ 
-    [];
+{ stdenv, fetchurl
+, zlib, curl, gnutls, fribidi, libpng, SDL, SDL_gfx, SDL_image, SDL_mixer
+, SDL_net, SDL_ttf, libunwind, libX11, xproto, libxml2, pkgconfig
+, gettext, intltool, libtool, perl
+}:
 
-  buildInputs = map (n: builtins.getAttr n x)
-    (builtins.attrNames (builtins.removeAttrs x helperArgNames));
-  sourceInfo = rec {
-    baseName="warmux";
-    version="11.04.1";
-    name="${baseName}-${version}";
-    url="http://download.gna.org/${baseName}/${name}.tar.bz2";
-    hash="1vp44wdpnb1g6cddmn3nphc543pxsdhjis52mfif0p2c7qslz73q";
-  };
-in
-rec {
-  src = a.fetchurl {
-    url = sourceInfo.url;
-    sha256 = sourceInfo.hash;
+stdenv.mkDerivation rec {
+  name = "warmux-${version}";
+  version = "11.04.1";
+
+  src = fetchurl {
+    url = "http://download.gna.org/warmux/${name}.tar.bz2";
+    sha256 = "1vp44wdpnb1g6cddmn3nphc543pxsdhjis52mfif0p2c7qslz73q";
   };
 
-  inherit (sourceInfo) name version;
-  inherit buildInputs;
+  buildInputs =
+    [ zlib curl gnutls fribidi libpng SDL SDL_gfx SDL_image SDL_mixer
+      SDL_net SDL_ttf libunwind libX11 xproto libxml2 pkgconfig
+      gettext intltool libtool perl
+    ];
 
-  /* doConfigure should be removed if not needed */
-  phaseNames = ["doPatch" "doConfigure" "doMakeInstall"];
-
-  configureFlags = "CFLAGS=\"-include ${zlib}/include/zlib.h\"";
+  configureFlagsArray = ("CFLAGS=-include ${zlib}/include/zlib.h");
 
   patches = [ ./gcc-fix.patch ];
 
-  meta = {
+  meta = with stdenv.lib; {
     description = "Ballistics turn-based battle game between teams";
-    maintainers = with a.lib.maintainers;
+    maintainers = with maintainers;
     [
       raskin
     ];
-    platforms = with a.lib.platforms;
-      linux;
-    license = a.lib.licenses.gpl2;
+    platforms = platforms.linux;
+    license = licenses.gpl2;
+    downloadPage = "http://download.gna.org/warmux/";
   };
-  passthru = {
-    updateInfo = {
-      downloadPage = "http://download.gna.org/warmux/";
-    };
-  };
-}) x
-
+}