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