remove linux/if_arp.h from configure.ac The introduction of linux-libc-dev 4.9.30-1 resulted into a fails to build from source for 2.16 This patch fixes that FTBFS . See also the Debian bug report. Bug: URL to the upstream bug report if any, implies patch has been forwarded, optional Forwarded: <URL|no|not-needed, useless if you have a Bug field, optional> Applied-Upstream: version|URL|commit, identifies patches merged upstream, optional Reviewed-by: name and email of a reviewer, optional