-PREFERRED_VERSION_linux-raspberrypi = "4.9.%"
-PREFERRED_VERSION_mesa = "12.%"
-
-PREFERRED_PROVIDER_virtual/egl = "mesa"
-PREFERRED_PROVIDER_virtual/libgles2 = "mesa"
-PREFERRED_PROVIDER_virtual/libgl = "mesa"
-PREFERRED_PROVIDER_virtual/mesa = "mesa"
-PREFERRED_PROVIDER_jpeg = "jpeg"