PREFERRED_PROVIDER_virtual/mesa ?= "mesa-proprietary" PREFERRED_PROVIDER_virtual/libgl ?= "mesa-proprietary" PREFERRED_PROVIDER_virtual/libgles1 ?= "mesa-proprietary" PREFERRED_PROVIDER_virtual/libgles2 ?= "mesa-proprietary" PREFERRED_PROVIDER_virtual/egl ?= "mesa-proprietary" PREFERRED_PROVIDER_virtual/libgbm ?= "mesa-proprietary"