--- squid-3.5.2.orig/lib/rfcnb/rfcnb-io.c	2015-02-18 06:17:02.000000000 -0600
+++ squid-3.5.2/lib/rfcnb/rfcnb-io.c	2015-02-20 00:33:21.015450265 -0600
@@ -40,7 +40,7 @@
 #include <string.h>
 #endif
 #include <sys/uio.h>
-#include <sys/signal.h>
+#include <signal.h>
 
 int RFCNB_Timeout = 0;          /* Timeout in seconds ... */