make[4]: Entering directory `/home/rful011/syslog-ng-3.4.1/modules/afsocket' /bin/sh ../../libtool --tag=CC --mode=compile gcc -std=gnu99 -DHAVE_CONFIG_H -I. -I../.. -I../../lib -I../../lib -pthread -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/local/include/eventlog -D_BSD_SOURCE -D__BSD_SOURCE -D__FAVOR_BSD -DHAVE_NET_ETHERNET_H -I../../lib/ivykis/src/include -I../../lib/ivykis/src/include -D_GNU_SOURCE -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -g -O2 -Wall -pthread -MT libafsocket_notls_la-afinet-dest.lo -MD -MP -MF .deps/libafsocket_notls_la-afinet-dest.Tpo -c -o libafsocket_notls_la-afinet-dest.lo `test -f 'afinet-dest.c' || echo './'`afinet-dest.c libtool: compile: gcc -std=gnu99 -DHAVE_CONFIG_H -I. -I../.. -I../../lib -I../../lib -pthread -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/local/include/eventlog -D_BSD_SOURCE -D__BSD_SOURCE -D__FAVOR_BSD -DHAVE_NET_ETHERNET_H -I../../lib/ivykis/src/include -I../../lib/ivykis/src/include -D_GNU_SOURCE -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -g -O2 -Wall -pthread -MT libafsocket_notls_la-afinet-dest.lo -MD -MP -MF .deps/libafsocket_notls_la-afinet-dest.Tpo -c afinet-dest.c -fPIC -DPIC -o .libs/libafsocket_notls_la-afinet-dest.o In file included from /usr/include/net/ethernet.h:27, from /usr/include/libnet.h:98, from afinet-dest.c:43: when I first encountered this error I went and did some googling and followed some vague leads to install a bunch of -devel packages (most of which were already installed ) but it did not make any difference. Googling the message brings up a bunch of hits for both redhat and debian families and a range of packages. There did not seem to be any common cause. Russell