{ stdenv
, fetchurl
, makeWrapper
, jre
}:

stdenv.mkDerivation rec {
  name = "mars-${version}";
  version = "4.5";
  src = fetchurl {
    url = "http://courses.missouristate.edu/KenVollmar/mars/MARS_4_5_Aug2014/Mars4_5.jar";
    sha256 = "15kh1fahkkbbf4wvb6ijzny4fi5dh4pycxyzp5325dm2ddkhnd5c";
  };
  phases = "installPhase";
  buildInputs = [ makeWrapper ];
  installPhase = ''
    mkdir -p $out/bin
    makeWrapper "${jre}/bin/java -jar ${src}" $out/bin/mars
  '';
}