anchor.diff:        "CUPS_PRIMARY_SYSTEM_GROUP=root"
       ];
   
  -  postInstall =
  -    ''
  +  postInstall = ''
         # Delete obsolete stuff that conflicts with cups-filters.
         rm -rf $out/share/cups/banners $out/share/cups/data/testprint
   
  
positive.code:   };
  
    buildInputs = [ pkgconfig zlib libjpeg libpng libtiff libusb gnutls avahi libpaper ]
      ++ optionals stdenv.isLinux [ pam dbus.libs acl xdg_utils ] ;
  
    propagatedBuildInputs = [ gmp ];
  
  
negative.code:           mv "$f" "''${f/org\.cups\./}"
          fi
        done
      '' + optionalString stdenv.isLinux ''
        # Use xdg-open when on Linux
        substituteInPlace $out/share/applications/cups.desktop \
          --replace "Exec=htmlview" "Exec=xdg-open"
      '';
  
    meta = {
  