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-rw-r--r--contrib/ipfilter/ipsend/sock.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/contrib/ipfilter/ipsend/sock.c b/contrib/ipfilter/ipsend/sock.c
index 6907a08..77e53de 100644
--- a/contrib/ipfilter/ipsend/sock.c
+++ b/contrib/ipfilter/ipsend/sock.c
@@ -19,6 +19,7 @@ static const char rcsid[] = "@(#)$Id: sock.c,v 2.1.4.1 2000/12/16 21:05:44 darre
#include <sys/types.h>
#include <sys/time.h>
#include <sys/param.h>
+#include <sys/lock.h>
#include <sys/stat.h>
#ifndef ultrix
#include <fcntl.h>
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