SIGNATURE_CHECK (GNULIB_NAMESPACE::iswalnum, int, (wint_t));
SIGNATURE_CHECK (GNULIB_NAMESPACE::iswalpha, int, (wint_t));
+#if GNULIB_TEST_ISWBLANK
SIGNATURE_CHECK (GNULIB_NAMESPACE::iswblank, int, (wint_t));
+#endif
SIGNATURE_CHECK (GNULIB_NAMESPACE::iswcntrl, int, (wint_t));
SIGNATURE_CHECK (GNULIB_NAMESPACE::iswdigit, int, (wint_t));
SIGNATURE_CHECK (GNULIB_NAMESPACE::iswgraph, int, (wint_t));