-AC_CHECK_DECLS([gettid, pivot_root, name_to_handle_at, setns, getrandom, renameat2, kcmp, keyctl, key_serial_t, LO_FLAGS_PARTSCAN],
+AC_CHECK_DECLS([gettid, pivot_root, name_to_handle_at, setns, getrandom, renameat2,
+ char16_t, char32_t, LO_FLAGS_PARTSCAN],