SOL_NETLINK is used since commit 87a198111af1ea67053895f7435fb99e3cdd2159 resulting in the following build failure with glibc < 2.24: src/frame-xchg.c: In function 'frame_watch_group_io_read': src/frame-xchg.c:328:27: error: 'SOL_NETLINK' undeclared (first use in this function) if (cmsg->cmsg_level != SOL_NETLINK) ^ This failure is due to glibc that doesn't support SOL_NETLINK before version 2.24 and https://github.com/bminor/glibc/commit/f9b437d5efce93800b51ad2a437c8b1c96... Fixes: - http://autobuild.buildroot.org/results/3485088b84111c271bbcfaf025aa4103c6... Signed-off-by: Fabrice Fontaine <fontaine.fabrice(a)gmail.com&gt; --- src/frame-xchg.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/src/frame-xchg.c b/src/frame-xchg.c index 50351615..4c950fd3 100644 --- a/src/frame-xchg.c +++ b/src/frame-xchg.c @@ -42,6 +42,10 @@ #include "src/netdev.h" #include "src/frame-xchg.h" +#ifndef SOL_NETLINK +#define SOL_NETLINK 270 +#endif + struct watch_group { /* * Group IDs, except 0, are per wdev for user's convenience. -- 2.25.1