-# ulonglong.m4 serial 5
+# ulonglong.m4 serial 6
dnl Copyright (C) 1999-2006 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
# This fixes a bug in Autoconf 2.60, but can be removed once we
# assume 2.61 everywhere.
+# Note: If the type 'unsigned long long int' exists but is only 32 bits
+# large (as on some very old compilers), AC_TYPE_UNSIGNED_LONG_LONG_INT
+# will not be defined. In this case you can treat 'unsigned long long int'
+# like 'unsigned long int'.
+
AC_DEFUN([AC_TYPE_UNSIGNED_LONG_LONG_INT],
[
AC_CACHE_CHECK([for unsigned long long int],