diff -u -r a/ippool-1.3/usl/usl_timer.c b/ippool-1.3/usl/usl_timer.c
--- a/ippool-1.3/usl/usl_timer.c	2008-02-03 08:55:30.000000000 -0600
+++ b/ippool-1.3/usl/usl_timer.c	2014-10-15 23:26:38.073823470 -0500
@@ -42,6 +42,7 @@
 #include <signal.h>
 #include <string.h>
 #include <sys/time.h>
+#include <limits.h>
 
 #include "usl.h"