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-rw-r--r--include/netinet/in.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/netinet/in.h b/include/netinet/in.h
index 4b3f2b0b..1ed3e6fa 100644
--- a/include/netinet/in.h
+++ b/include/netinet/in.h
@@ -199,6 +199,7 @@ uint16_t ntohs(uint16_t);
#define IP_RECVORIGDSTADDR IP_ORIGDSTADDR
#define IP_MINTTL 21
#define IP_NODEFRAG 22
+#define IP_CHECKSUM 23
#define IP_MULTICAST_IF 32
#define IP_MULTICAST_TTL 33
#define IP_MULTICAST_LOOP 34