anchor.diff:        else
           [
             "-${lib.optionalString (compareVersion "5.9.0" < 0) "no-"}rpath"
  -
  +        ]
  +        ++ lib.optional (compareVersion "5.15.0" < 0) "-system-xcb"
  +        ++ [
             "-xcb"
             "-qpa xcb"
             "-L" "${libX11.out}/lib"
  
positive.code:           ''-${lib.optionalString (cups == null) "no-"}cups''
            "-dbus-linked"
            "-glib"
            "-system-libpng"
          ]
          ++ lib.optional withGtk3 "-gtk"
  
negative.code:       ''-${lib.optionalString (!buildExamples) "no"}make examples''
        ''-${lib.optionalString (!buildTests) "no"}make tests''
      ]
      ++ lib.optional (compareVersion "5.15.0" < 0) "-v"
  
      ++ (
        if stdenv.isDarwin
  