anchor.diff:    buildInputs = [
       gnutls
       cairo
  +    gdk-pixbuf
  +    zlib
       glib
       libgcrypt
       cyrus_sasl
  
positive.code: , gettext
  , perl
  , gnome3
  }:
  
  stdenv.mkDerivation rec {
  
negative.code: 
    passthru = {
      updateScript = gnome3.updateScript {
        packageName = pname;
        versionPolicy = "none";
      };
    };
  