anchor.diff:    propagatedBuildInputs = [ glibmm gtk3 atkmm cairomm pangomm ];
   
     enableParallelBuilding = true;
  -  doCheck = true;
  +
  +  # https://bugzilla.gnome.org/show_bug.cgi?id=764521
  +  doCheck = false;
   
     meta = with stdenv.lib; {
       description = "C++ interface to the GTK+ graphical user interface library";
  
positive.code: { stdenv, fetchurl, pkgconfig, gtk3, glibmm, cairomm, pangomm, atkmm, epoxy }:
  
  let
    ver_maj = "3.18";
    ver_min = "0";
  in
  stdenv.mkDerivation rec {
  
negative.code: 
    src = fetchurl {
      url = "mirror://gnome/sources/gtkmm/${ver_maj}/${name}.tar.xz";
      sha256 = "12h2kd22iayvjfhmgjccm33igrbvqdj7hym31fsa1y0dhwzmf8gh";
    };
  
    nativeBuildInputs = [ pkgconfig ];
  