anchor.diff:  
       homepage = http://gtkmm.org/;
   
  -    license = stdenv.lib.licenses.lgpl2Plus;
  +    license = licenses.lgpl2Plus;
   
  -    maintainers = with stdenv.lib.maintainers; [ raskin urkud vcunat ];
  -    platforms = stdenv.lib.platforms.unix;
  +    maintainers = with maintainers; [ raskin vcunat ];
  +    platforms = platforms.unix;
     };
   }
  
positive.code: { stdenv, fetchurl, pkgconfig, gtk3, glibmm, cairomm, pangomm, atkmm }:
  
  let
    ver_maj = "3.16";
    ver_min = "0";
  in
  stdenv.mkDerivation rec {
  
negative.code: 
    src = fetchurl {
      url = "mirror://gnome/sources/gtkmm/${ver_maj}/${name}.tar.xz";
      sha256 = "829fa113daed74398c49c3f2b7672807f58ba85d0fa463f5bc726e1b0138b86b";
    };
  
    nativeBuildInputs = [ pkgconfig ];
    buildInputs = [ epoxy ];
  
    propagatedBuildInputs = [ glibmm gtk3 atkmm cairomm pangomm ];
  
    enableParallelBuilding = true;
    doCheck = true;
  
    meta = with stdenv.lib; {
      description = "C++ interface to the GTK+ graphical user interface library";
  
      longDescription = ''
  