Compute the value of ULONG_MAX for use in the testsute.

@@ -306,6 +306,23 @@ AC_CHECK_TYPE(socklen_t, , AC_DEFINE(socklen_t, int, [Define to int if <sys/type
 AC_CHECK_TYPE(long long, , AC_DEFINE(LONG_LONG, long, [Define to long if compiler does not support]))
 AC_CHECK_TYPE(long double, , AC_DEFINE(LONG_DOUBLE, double, [Define to double if compiler does not support]))
 
+AC_SUBST(MU_ULONG_MAX)
+AC_RUN_IFELSE([AC_LANG_PROGRAM(
+[#include <stdio.h>
+#include <stdlib.h>
+#include <limits.h>],
+[
+ FILE *f = fopen ("conftest.val", "w");
+ if (! f)
+    exit (1);
+ fprintf(f, "%lu\n", ULONG_MAX);
+ fclose(f);
+ return 0;]
+)],
+ [MU_ULONG_MAX=`cat conftest.val`],
+ [MU_ULONG_MAX=0],
+ [MU_ULONG_MAX=0])
+
 AC_STRUCT_TM
 AC_CHECK_MEMBERS([struct tm.tm_zone, struct tm.tm_gmtoff, struct tm.tm_isdst],
                  ,,