anchor.diff:  , zlib, libjpeg, libpng, libtiff, sqlite, icu
   
   , coreutils, bison, flex, gdb, gperf, lndir, ruby
  -, python, perl, pkgconfig
  +, patchelf, perl, pkgconfig, python
   
   # optional dependencies
   , cups ? null
  
positive.code:         --replace "@mesa_lib@" "${mesa.out}" \
          --replace "@mesa_inc@" "${mesa.dev}"
      '';
  
    setOutputFlags = false;
    preConfigure = ''
  
negative.code:       substituteInPlace \
          qtbase/src/plugins/platforminputcontexts/compose/generator/qtablegenerator.cpp \
          --replace "@libX11@" "${libX11.out}"
      ''
      + lib.optionalString mesaSupported ''
        substituteInPlace \
  