- [AC_CACHE_CHECK([for mbstate_t object type], ac_cv_type_mbstate_t_object,
- [AC_TRY_COMPILE([#include <stdio.h>
+ [
+ # Check for the mbstate_t type.
+ ac_mbs_tmp=$ac_includes_default
+ ac_includes_default="
+$ac_includes_default
+#if HAVE_WCHAR_H
+# include <wchar.h>
+#endif
+"
+ AC_CHECK_TYPE(mbstate_t, int)
+ # Restore the default value.
+ ac_includes_default=$ac_mbs_tmp
+
+ AC_CACHE_CHECK([for mbstate_t object type], ac_cv_type_mbstate_t_object,
+ [AC_TRY_COMPILE([
+#if HAVE_STDLIB_H
+# include <stdlib.h>
+#endif