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-rw-r--r--sysdeps/unix/sysv/linux/bits/in.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/bits/in.h b/sysdeps/unix/sysv/linux/bits/in.h
index 43db11ce35..f684736ee8 100644
--- a/sysdeps/unix/sysv/linux/bits/in.h
+++ b/sysdeps/unix/sysv/linux/bits/in.h
@@ -91,6 +91,7 @@
 
 #define IP_MINTTL       21
 #define IP_NODEFRAG     22
+#define IP_CHECKSUM     23
 
 /* IP_MTU_DISCOVER arguments.  */
 #define IP_PMTUDISC_DONT   0	/* Never send DF frames.  */