if (HAVE_DRM)
    add_subdirectory(drm)
endif()
if (HAVE_LINUX_FB_H)
    add_subdirectory(fbdev)
endif()
if (HAVE_LIBHYBRIS)
    add_subdirectory(hwcomposer)
endif()
add_subdirectory(virtual)
add_subdirectory(wayland)
add_subdirectory(x11)
