anchor.diff:      libglvnd
       libomxil-bellagio
       libpthread-stubs
  -    # FIXME: recursive dependency
  -    #libva
  +    #libva  # FIXME: recursive dependency
       libvdpau
       libx11
       libxcb
  
positive.code:     };
    };
  
    meta = with stdenv.lib; {
      description = "An open source implementation of OpenGL";
      homepage = http://www.mesa3d.org/;
      license = licenses.mit;
  
negative.code:           "$lib"
        fi
      done
    '' + /* set the default search path for DRI drivers */ ''
      sed -i "$out/lib/pkgconfig/dri.pc" \
        -e 's,$(drivers),${driverSearchPath},'
    '';
  