find_matching_files_in_search_path (backend_search_path (),
so_extension_pattern, backend_modules);
find_matching_files_in_search_path (backend_search_path (),
dylib_extension_pattern, backend_modules);
find_matching_files_in_search_path (backend_search_path (),
so_extension_pattern, backend_modules);
find_matching_files_in_search_path (backend_search_path (),
dylib_extension_pattern, backend_modules);