[PATCH] ping: fix building on older systems

[PATCH] ping: fix building on older systems

[Mike Frysinger]

The SO_MARK define is somewhat recent (linux-2.6.25), so check for its
existence before we try to use it.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
---
 ping_common.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/ping_common.c b/ping_common.c
index 82320b1..b4b26b2 100644
--- a/ping_common.c
+++ b/ping_common.c
@@ -475,6 +475,7 @@ void setup(int icmp_sock)
 			fprintf(stderr, "Warning: no SO_TIMESTAMP support, falling back to SIOCGSTAMP\n");
 	}
 #endif
+#ifdef SO_MARK
 	if (options & F_MARK) {
 		if (setsockopt(icmp_sock, SOL_SOCKET, SO_MARK,
 				&mark, sizeof(mark)) == -1) {
@@ -484,6 +485,7 @@ void setup(int icmp_sock)
 			fprintf(stderr, "Warning: Failed to set mark %d\n", mark);
 		}
 	}
+#endif
 
 	/* Set some SNDTIMEO to prevent blocking forever
 	 * on sends, when device is too slow or stalls. Just put limit
-- 
1.7.4.1