This patch is used to get around a compiling problem with ntp-4.2.8p6. It is
not needed on versions prior to that. The problem has been reported as NTP
community bug 2994, http://bugs.ntp.org/show_bug.cgi?id=2994 and may be removed
for versions of NTP with this bug fixed.

--- ntpd/ntpd.c
+++ ntpd/ntpd.c
@@ -159,6 +159,10 @@ int priority_done = 2;		/* 0 - Set prior
 
 int listen_to_virtual_ips = TRUE;
 
+#if defined(HAVE_SIGNALED_IO) && defined(DEBUG_TIMING)
+# undef DEBUG_TIMING
+#endif
+
 /*
  * No-fork flag.  If set, we do not become a background daemon.
  */