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-rw-r--r--src/cthelper.c1
-rw-r--r--src/helpers/ftp.c1
-rw-r--r--src/helpers/sane.c1
-rw-r--r--src/helpers/tns.c1
4 files changed, 4 insertions, 0 deletions
diff --git a/src/cthelper.c b/src/cthelper.c
index fec40fb..bd8b8b7 100644
--- a/src/cthelper.c
+++ b/src/cthelper.c
@@ -31,6 +31,7 @@
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
+#define _GNU_SOURCE
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <net/ethernet.h>
diff --git a/src/helpers/ftp.c b/src/helpers/ftp.c
index e7fe7f7..24ee877 100644
--- a/src/helpers/ftp.c
+++ b/src/helpers/ftp.c
@@ -25,6 +25,7 @@
#include <ctype.h> /* for isdigit */
#include <errno.h>
+#define _GNU_SOURCE
#include <netinet/tcp.h>
#include <libmnl/libmnl.h>
diff --git a/src/helpers/sane.c b/src/helpers/sane.c
index 79ca948..c30f4ba 100644
--- a/src/helpers/sane.c
+++ b/src/helpers/sane.c
@@ -30,6 +30,7 @@
#include "log.h"
#include <errno.h>
#include <netinet/ip.h>
+#define _GNU_SOURCE
#include <netinet/tcp.h>
#include <libmnl/libmnl.h>
#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
diff --git a/src/helpers/tns.c b/src/helpers/tns.c
index 5833fea..2b4fed4 100644
--- a/src/helpers/tns.c
+++ b/src/helpers/tns.c
@@ -18,6 +18,7 @@
#include <ctype.h> /* for isdigit */
#include <errno.h>
+#define _GNU_SOURCE
#include <netinet/tcp.h>
#include <libmnl/libmnl.h>