{stdenv, fetchurl, ocaml, lablgtk, fontschumachermisc, xset, makeWrapper}:

stdenv.mkDerivation {
  name = "unison-2.13.16";
  src = fetchurl {
    url = http://www.seas.upenn.edu/~bcpierce/unison//download/releases/stable/unison-2.13.16.tar.gz;
    sha256 = "808400a933aeb67654edc770822cd186d1b2adc92e7cb5836996c71c69ffe656";
  };

  buildInputs = [ocaml makeWrapper];

  preBuild = "sed -i \"s|\\(OCAMLOPT=.*\\)$|\\1 -I ${lablgtk}/lib/ocaml/lablgtk2|\" Makefile.OCaml";
  makeFlags = "UISTYLE=gtk2 INSTALLDIR=$(out)/bin/";
  preInstall = "ensureDir $out/bin";
  postInstall = ''
    for i in $(cd $out/bin && ls); do
      wrapProgram $out/bin/$i \
        --run "${xset}/bin/xset q | grep -q \"${fontschumachermisc}\" || ${xset}/bin/xset +fp \"${fontschumachermisc}/lib/X11/fonts/misc\""
    done
  '';
}