if not meson.is_cross_build()
if not prefix_path.contains('/usr')
dir_path_x11_backend = join_paths(prefix_path, 'include', libweston_version, 'libweston', 'backend-x11.h')
if not meson.is_cross_build()
if not prefix_path.contains('/usr')
dir_path_x11_backend = join_paths(prefix_path, 'include', libweston_version, 'libweston', 'backend-x11.h')