anchor.diff:      "--with-dri-driverdir=$(drivers)/lib/dri"
       "--with-dri-searchpath=${driverSearchPath}/lib/dri"
       "--with-dri-drivers=i915,i965,nouveau,radeon,r200,swrast"
  -    # TODO: vulkan support
  -    #"--with-vulkan-drivers=intel"
  +    "--with-vulkan-drivers=intel"
       #"--with-vulkan-icddir=DIR"
       #osmesa-bits=8
       #"--with-clang-libdir=${llvm}/lib"
  
positive.code:     "--enable-dri3"
      "--enable-glx"
      "--disable-osmesa"
      "--enable-gallium-osmesa" # used by wine
      "--enable-egl"
      "--enable-xa" # used in vmware driver
      "--enable-gbm"
  
negative.code:     "--enable-xvmc"
      "--enable-vdpau"
      "--enable-omx"
      # FIXME: We use mesa as libgl at build time and libva depends on libgl
      #"--enable-va"
      # TODO: Figure out how to enable opencl without having a
      #       runtime dependency on clang
  