-# serial 1
+# serial 2
# From Paul Eggert.
# so you can't declare an object of that type.
# Check for this incompatibility with Standard C.
+# Include stdio.h first, because otherwise this test would fail on Linux
+# (at least 2.2.16) because the `_XOPEN_SOURCE 500' definition elicits
+# a syntax error in wchar.h due to the use of undefined __int32_t.
+
AC_DEFUN(AC_MBSTATE_T_OBJECT,
[AC_CACHE_CHECK([for mbstate_t object type], ac_cv_type_mbstate_t_object,
- [AC_TRY_COMPILE([#include <wchar.h>],
+ [AC_TRY_COMPILE([#include <stdio.h>
+#include <wchar.h>],
[mbstate_t x; return sizeof x;],
ac_cv_type_mbstate_t_object=yes,
ac_cv_type_mbstate_t_object=no)])