gistfile1.txt

{stdenv, fetchurl, itstool, buildPythonPackage, python27, intltool, scrollkeeper, makeWrapper, libxml2, pygobject3, gobjectIntrospection, gtk3, pygtk, gnome3}:

let
  minor = "3.12";
  version = "${minor}.3";
in

# Requirements
# [x] Python 2.7 (Python 3 not yet supported)
# [x] GTK+ 3.6 (3.12 in development)
# [x] GLib 2.34 (2.36 in development)
# [x] PyGObject 3.8
# [ ] GtkSourceView 3.6 (3.10 in development)

buildPythonPackage rec {
  name = "meld-${version}";

  src = fetchurl {
    url = "mirror://gnome/sources/meld/${minor}/meld-${version}.tar.xz";
    sha256 = "1zg6qhm53j0vxmjj3pcj2hwi8c12dxzmlh98zks0jnwhqv2p4dfv";
  };

  buildInputs = [ python27 intltool scrollkeeper makeWrapper itstool libxml2 pygobject3 gobjectIntrospection gtk3 ];
  propagatedBuildInputs = [ gobjectIntrospection pygobject3 gtk3 pygtk];

  installPhase = ''
    mkdir -p "$out/lib/${python27.libPrefix}/site-packages"

    export PYTHONPATH="$out/lib/${python27.libPrefix}/site-packages:$PYTHONPATH"

    ${python27}/bin/${python27.executable} setup.py install \
      --install-lib=$out/lib/${python27.libPrefix}/site-packages \
      --prefix="$out"
  '';

  patchPhase = ''
    sed -e 's,#!.*,#!${python27}/bin/python27,' -i bin/meld
  '';

  postInstall = ''
    wrapProgram $out/bin/meld --prefix GI_TYPELIB_PATH : "$GI_TYPELIB_PATH" \
      --prefix LD_LIBRARY_PATH : "${gnome3.gtk3}/lib" \
  '';

  meta = with stdenv.lib; {
    description = "Visual diff and merge tool";
    homepage = http://meld.sourceforge.net;
    license = stdenv.lib.licenses.gpl2;
    platforms = platforms.linux ++ stdenv.lib.platforms.darwin;
  };
}

meld
Cannot import: GTK+
cannot import name Gtk