anchor.diff:  
     NIX_CFLAGS_COMPILE = "-fpermissive"; # GL header minor incompatibility
   
  -  postInstall = []
  -    ++ stdenv.lib.optional withVideos "cp ${sequences_src} $out/share/warzone2100/sequences.wz";
  +  postInstall = stdenv.lib.optionalString withVideos "cp ${sequences_src} $out/share/warzone2100/sequences.wz";
   
     meta = with stdenv.lib; {
       description = "A free RTS game, originally developed by Pumpkin Studios";
  
positive.code: { stdenv, fetchurl, bison, flex, gettext, pkgconfig, libpng
  , libtheora, openal, physfs, mesa, fribidi, fontconfig
  , freetype, qt4, glew, libogg, libvorbis, zlib, libX11
  , libXrandr, zip, unzip, which
  , withVideos ? false
  }:
  stdenv.mkDerivation rec {
    pname = "warzone2100";
    version = "3.1.1";
    name = "${pname}-${version}";
    src = fetchurl {
      url = "mirror://sourceforge/${pname}/releases/${version}/${name}.tar.xz";
      sha256 = "c937a2e2c7afdad00b00767636234bbec4d8b18efb008073445439d32edb76cf";
    };
    sequences_src = fetchurl {
      url = "mirror://sourceforge/${pname}/warzone2100/Videos/high-quality-en/sequences.wz";
      sha256 = "90ff552ca4a70e2537e027e22c5098ea4ed1bc11bb7fc94138c6c941a73d29fa";
    };
    buildInputs = [ bison flex gettext pkgconfig libpng libtheora openal
                    physfs mesa fribidi fontconfig freetype qt4
                    glew libogg libvorbis zlib libX11 libXrandr zip
                    unzip
                  ];
    patchPhase = ''
      substituteInPlace lib/exceptionhandler/dumpinfo.cpp \
  
negative.code:       missiles. The game offers campaign, multi-player, and single-player
        skirmish modes. An extensive tech tree with over 400 different
        technologies, combined with the unit design system, allows for a wide
        variety of possible units and tactics.
      '';
      homepage = http://wz2100.net;
      license = licenses.gpl2Plus;
  