anchor.diff:  { stdenv, fetchurl, unzip, SDL, mesa, openal, curl, libXxf86vm }:
  +
   stdenv.mkDerivation rec {
     name = "urbanterror-${version}";
  -  version = "4.2.023";
  +  version = "4.3.1";
  +
     srcs =
       [ (fetchurl {
  -         url = "http://mirror.urtstats.net/urbanterror/UrbanTerror42_full023.zip";
  -         sha256 = "e287e2a17432b81551f5c16e431d752484ce9be10508e756542f653757a29090";
  +         url = "http://cdn.fs1.urbanterror.info/urt/43/releases/zips/UrbanTerror431_full.zip";
  +         sha256 = "1dfnyb2grf2fxxphwj7p2ff721j2l0gwrj76jzympr32sim5a6cw";
          })
         (fetchurl {
  -         url = "https://github.com/Barbatos/ioq3-for-UrbanTerror-4/archive/release-4.2.023.tar.gz";
  -         sha256 = "03zrrx5b96c1srf2p24ca7zygq84byvrmcgh42d8bh5ds579ziqp";
  +         url = "https://github.com/Barbatos/ioq3-for-UrbanTerror-4/archive/release-4.3.1.zip";
  +         sha256 = "1rbiqa1ki73649np3af96cilavkgv66a0b6p0a5x26cxvpgg128k";
          })
       ];
  -  buildInputs = [ unzip SDL mesa openal curl libXxf86vm];
  -  sourceRoot = "ioq3-for-UrbanTerror-4-release-4.2.023";
  +
  +  buildInputs = [ unzip SDL mesa openal curl libXxf86vm ];
  +  sourceRoot = "ioq3-for-UrbanTerror-4-release-4.3.1";
  +
     configurePhase = ''
       echo "USE_OPENAL = 1" > Makefile.local
       echo "USE_OPENAL_DLOPEN = 0" >> Makefile.local
       echo "USE_CURL = 1" >> Makefile.local
       echo "USE_CURL_DLOPEN = 0" >> Makefile.local
     '';
  +
     installPhase = ''
       destDir="$out/opt/urbanterror"
       mkdir -p "$destDir"
  
positive.code:           "$destDir/Quake3-UrT"
      cp -v build/release-linux-*/Quake3-UrT-Ded.* \
            "$destDir/Quake3-UrT-Ded"
      cp -rv ../UrbanTerror42/q3ut4 "$destDir"
      cat << EOF > "$out/bin/urbanterror"
      #! ${stdenv.shell}
      cd "$destDir"
  
negative.code:     EOF
      chmod +x "$out/bin/urbanterror-ded"
    '';
  
    postFixup = ''
      p=$out/opt/urbanterror/Quake3-UrT
      cur_rpath=$(patchelf --print-rpath $p)
      patchelf --set-rpath $cur_rpath:${mesa}/lib $p
    '';
  
    hardeningDisable = [ "format" ];
  
    meta = with stdenv.lib; {
      description = "A multiplayer tactical FPS on top of Quake 3 engine";
      longDescription = ''
  