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-rw-r--r--contrib/tcpdump/print-esp.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/contrib/tcpdump/print-esp.c b/contrib/tcpdump/print-esp.c
index 1bdf76a..33edf8a 100644
--- a/contrib/tcpdump/print-esp.c
+++ b/contrib/tcpdump/print-esp.c
@@ -50,6 +50,7 @@ static const char rcsid[] =
#endif
#include <stdio.h>
+#include <unistd.h>
#include "ip.h"
#include "esp.h"
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