From 9a230ba419eb3bd74c82dd7560cbb09b4b027b8a Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Thu, 25 Jan 2018 22:32:57 +0100
Subject: [PATCH] configure: fix the check for unsigned time_t

Assign the time_t variable negative value and then check if it is
greater than zero, which will evaluate true for unsigned time_t but
false for signed time_t.
---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 76fa93d1b..d305e9693 100755
--- a/configure.ac
+++ b/configure.ac
@@ -3488,7 +3488,7 @@ AC_RUN_IFELSE([
   AC_LANG_SOURCE([[
   #include <time.h>
   #include <limits.h>
-  time_t t = ULONG_MAX;
+  time_t t = -1;
   return (t > 0);
   ]])] ,[
   AC_MSG_RESULT([yes])