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-rw-r--r--sysdeps/unix/sysv/linux/bits/in.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/sysdeps/unix/sysv/linux/bits/in.h b/sysdeps/unix/sysv/linux/bits/in.h
index d75c07b9fd..9bdadf3c8f 100644
--- a/sysdeps/unix/sysv/linux/bits/in.h
+++ b/sysdeps/unix/sysv/linux/bits/in.h
@@ -30,7 +30,9 @@
/* This is not quite the same API since the kernel always defines s6_addr16 and
s6_addr32. This is not a violation of POSIX since POSIX says "at least the
following member" and that holds true. */
-# define __USE_KERNEL_IPV6_DEFS
+# define __USE_KERNEL_IPV6_DEFS 1
+#else
+# define __USE_KERNEL_IPV6_DEFS 0
#endif
/* Options for use with `getsockopt' and `setsockopt' at the IP level.