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diff --git a/m4/mbstate_t.m4 b/m4/mbstate_t.m4
index 2c14444..ae2bcf1 100644
--- a/m4/mbstate_t.m4
+++ b/m4/mbstate_t.m4
@@ -1,39 +1,29 @@
-# serial 4
+# serial 9
 
 # From Paul Eggert.
 
-# Some versions of BeOS define mbstate_t to be an incomplete type,
+# BeOS 5 has <wchar.h> but does not define mbstate_t,
 # so you can't declare an object of that type.
 # Check for this incompatibility with Standard C.
 
 # Include stdlib.h first, because otherwise this test would fail on Linux
-# (at least glibc-2.1.3) because the `_XOPEN_SOURCE 500' definition elicits
+# (at least glibc-2.1.3) 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_DEFUN([AC_MBSTATE_T],
   [
-   # 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_CHECK_HEADERS(stdlib.h)
 
-   AC_CACHE_CHECK([for mbstate_t object type], ac_cv_type_mbstate_t_object,
+   AC_CACHE_CHECK([for mbstate_t], ac_cv_type_mbstate_t,
     [AC_TRY_COMPILE([
 #if HAVE_STDLIB_H
 # include <stdlib.h>
 #endif
 #include <wchar.h>],
       [mbstate_t x; return sizeof x;],
-      ac_cv_type_mbstate_t_object=yes,
-      ac_cv_type_mbstate_t_object=no)])
-   if test $ac_cv_type_mbstate_t_object = yes; then
-     AC_DEFINE(HAVE_MBSTATE_T_OBJECT, 1,
-	       [Define if mbstate_t is an object type.])
+      ac_cv_type_mbstate_t=yes,
+      ac_cv_type_mbstate_t=no)])
+   if test $ac_cv_type_mbstate_t = no; then
+     AC_DEFINE(mbstate_t, int,
+	       [Define to a type if <wchar.h> does not define.])
    fi])