anchor.diff:      optionalString
       splitString;
   
  -  version = "18.0.3";
  +  version = "18.1.1";
   
     # This is the default search path for DRI drivers
     driverSearchPath = "/run/opengl-driver-${stdenv.targetSystem}";
  
positive.code:     "--${boolEn (buildConfig != "opengl-dummy")}-xvmc"
      "--${boolEn (buildConfig != "opengl-dummy")}-vdpau"
      "--${boolEn (buildConfig != "opengl-dummy")}-omx-bellagio"
      "--${boolEn (buildConfig != "opengl-dummy")}-va"
      # TODO: Figure out how to enable opencl without having a
      #       runtime dependency on clang
  
negative.code:       -i src/gallium/drivers/freedreno/Makefile.am
    '' + /* Files are unnecessarily pre-generated for an older LLVM version */ ''
      # https://github.com/mesa3d/mesa/commit/5233eaf9ee85bb551ea38c1e2bbd8ac167754e50
      rm src/gallium/drivers/swr/rasterizer/jitter/gen_builder.hpp
    '' + /* Install glvnd files in the current prefix */ ''
      sed -i src/egl/Makefile.am \
        -e 's/LIBGLVND_DATADIR/DATADIR/'
  