anchor.diff:  { fetchurl, stdenv, libGLU_combined, freeglut, libX11, plib, openal, freealut, libXrandr, xorgproto,
   libXext, libSM, libICE, libXi, libXt, libXrender, libXxf86vm, openscenegraph, expat,
  -libpng, zlib, bash, SDL2, enet, libjpeg, cmake, pkgconfig, libvorbis, runtimeShell }:
  +libpng, zlib, bash, SDL2, enet, libjpeg, cmake, pkgconfig, libvorbis, runtimeShell, curl }:
   
  +let
  +  version = "2.2.2-r6553";
  +  shortVersion = builtins.substring 0 5 version;
  +in
   stdenv.mkDerivation rec {
  -  version = "2.2.1-r6404";
  -  name = "speed-dreams-${version}";
  +  inherit version;
  +  pname = "speed-dreams";
   
     src = fetchurl {
  -    url = "mirror://sourceforge/speed-dreams/2.2.1/speed-dreams-src-base-${version}.tar.xz";
  -    sha256 = "0347sk8xbdsyvl48qybbycd7hvzsx5b37zzjx1yx73nzddhmlpbx";
  +    url = "mirror://sourceforge/speed-dreams/${shortVersion}/speed-dreams-src-base-${version}.tar.xz";
  +    sha256 = "1l47d2619kpfkvdwbkwr311qss6jjfwvgl5h9z2w3bwdgz0mbaij";
     };
   
     cars-and-tracks = fetchurl {
  -    url = "mirror://sourceforge/speed-dreams/2.2.1/speed-dreams-src-hq-cars-and-tracks-${version}.tar.xz";
  -    sha256 = "1h50l110n42nrq6j3kcyhi3swgmrjcg979vb6h0zsf46afwv0z3q";
  +    url = "mirror://sourceforge/speed-dreams/${shortVersion}/speed-dreams-src-hq-cars-and-tracks-${version}.tar.xz";
  +    sha256 = "0l8ba5pzqqcfy4inyxy2lrrhhgfs43xab7fy751xz2xqpqpfksyq";
     };
   
     more-cars-and-tracks = fetchurl {
  -    url = "mirror://sourceforge/speed-dreams/2.2.1/speed-dreams-src-more-hq-cars-and-tracks-${version}.tar.xz";
  -    sha256 = "03m3gwd03jqgsfjdglzmrv613cp4gh50i63fwmnwl282zhxydcwd";
  +    url = "mirror://sourceforge/speed-dreams/${shortVersion}/speed-dreams-src-more-hq-cars-and-tracks-${version}.tar.xz";
  +    sha256 = "10w180mhhk6dw4cza6mqa0hp5qgym9lcizfwykqbgcvs01yl2yqb";
     };
   
     wip-cars-and-tracks = fetchurl {
  -    url = "mirror://sourceforge/speed-dreams/2.2.1/speed-dreams-src-wip-cars-and-tracks-${version}.tar.xz";
  -    sha256 = "0ysk756rd294xzpwvmjh0mb229ngzrc4ry9lpyhyak98rbcp9hxm";
  +    url = "mirror://sourceforge/speed-dreams/${shortVersion}/speed-dreams-src-wip-cars-and-tracks-${version}.tar.xz";
  +    sha256 = "1wad9yaydaryhyi7ckyaii124h0z7kziqgcl475a5jr7ggbxc24q";
     };
   
     sourceRoot = ".";
  
positive.code:     tar -xf ${cars-and-tracks}
      tar -xf ${more-cars-and-tracks}
      tar -xf ${wip-cars-and-tracks}
    '';
  
    prePatch = ''
      # https://sourceforge.net/p/speed-dreams/mailman/message/35665539/
      sed -i "s|lastSlash = '\\\0'|lastSlash = NULL|" src/libs/tgf/params.cpp
      sed -i "s|const char\* error = '\\\0'|const char\* error = NULL|" src/libs/tgfclient/openalmusicplayer.cpp
    '';
  
    preBuild = ''
  
negative.code: 
    buildInputs = [ libpng libGLU_combined freeglut libX11 plib openal freealut libXrandr xorgproto
      libXext libSM libICE libXi libXt libXrender libXxf86vm zlib bash expat
      SDL2 enet libjpeg openscenegraph libvorbis curl ];
  
    meta = {
      description = "Car racing game - TORCS fork with more experimental approach";
      homepage = "http://speed-dreams.sourceforge.net/";
      license = stdenv.lib.licenses.gpl2Plus;
      maintainers = with stdenv.lib.maintainers; [raskin];
      platforms = stdenv.lib.platforms.linux;
  