anchor.diff:  
     src = fetchurl {
       url = "mirror://gnome/sources/gobject-introspection/${ver_maj}/${name}.tar.xz";
  -    sha256 = "1b972qg2yb51sdavfvb6kc19akwc15c1bwnbg81vadxamql2q33g";
  +    sha256 = "6658bd3c2b8813eb3e2511ee153238d09ace9d309e4574af27443d87423e4233";
     };
   
     buildInputs = [ flex bison pkgconfig python ]
  
positive.code: # In that case its about 6MB which could be separated
  
  let
    ver_maj = "1.44";
    ver_min = "0";
  in
  stdenv.mkDerivation rec {
  
negative.code:   # Tests depend on cairo, which is undesirable (it pulls in lots of
    # other dependencies).
    configureFlags = [ "--disable-tests" ];
  
    preConfigure = ''
      sed 's|/usr/bin/env ||' -i tools/g-ir-tool-template.in
    '';
  
    postInstall = "rm -rf $out/share/gtk-doc";
  
  