Remove unused file ptrdiff_max.m4.

[gnulib.git] / m4 / wcwidth.m4

diff --git a/m4/wcwidth.m4 b/m4/wcwidth.m4
index 09cf55a..e8a37f2 100644 (file)
--- a/m4/wcwidth.m4
+++ b/m4/wcwidth.m4
@@ -1,4 +1,4 @@
-# wcwidth.m4 serial 3
+# wcwidth.m4 serial 6
 dnl Copyright (C) 2006 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -11,16 +11,21 @@ AC_DEFUN([gl_FUNC_WCWIDTH],
 
   AC_REQUIRE([AC_C_INLINE])
   AC_REQUIRE([gt_TYPE_WCHAR_T])
+  AC_REQUIRE([gt_TYPE_WINT_T])
 
   AC_CHECK_HEADERS_ONCE([wchar.h wctype.h])
   AC_CHECK_FUNCS_ONCE([iswprint wcwidth])
 
   AC_CHECK_DECLS([wcwidth], [], [], [
 /* AIX 3.2.5 declares wcwidth in <string.h>. */
-#if HAVE_STRING_H
-# include <string.h>
-#endif
+#include <string.h>
 #if HAVE_WCHAR_H
+/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
+   <wchar.h>.
+   BSD/OS 4.1 has a bug: <stdio.h> and <time.h> must be included before
+   <wchar.h>.  */
+# include <stdio.h>
+# include <time.h>
 # include <wchar.h>
 #endif
 ])])