@@ -492,10 +492,13 @@
 	[AC_DEFINE(OF_HAVE_MAX_ALIGN_T, 1, [Whether we have max_align_t])])
 
 AC_CHECK_HEADER(stdnoreturn.h,
 	[AC_DEFINE(OF_HAVE_STDNORETURN_H, 1, [Whether we have stdnoreturn.h])])
 
+AC_CHECK_TYPE(wchar_t)
+AC_CHECK_HEADER(wchar.h)
+
 AC_CHECK_SIZEOF(float)
 AC_CHECK_SIZEOF(double)
 AS_IF([test x"$ac_cv_sizeof_float" != x"4" -o x"$ac_cv_sizeof_double" != x"8"],
 	[AC_MSG_ERROR(
 		[Floating point implementation does not conform to IEEE 754!])])