{stdenv, fetchFromGitHub, jdk6, ant_1_7}: stdenv.mkDerivation rec {
    pname = "velocity";
    version = "1.3";
    outJar = "velocity-1.3.jar";

    src = fetchFromGitHub {
        owner = "apache";
        repo = "velocity-engine";
        rev = "d2ceb7fa0a0fa397a1a513af7b7cc0f53b0d1f80";
        hash = "sha256-eSZA1j1rRXbly8VWSTD6VNVRmgPR0mma+lYUn1HFQIM=";
    };

    patches = [./velocity.patch];

    nativeBuildInputs = [jdk6 ant_1_7];

    env = {
        JAVA_HOME="${jdk6}";
    };

    buildPhase = ''
        cd build
        ant
        cd ..
    '';

    installPhase = ''
        mkdir $out
        cp ./bin/velocity-1.3.jar $out/velocity-1.3.jar
    '';
}