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-bash-2.05b# make freebsd4
if [ ! -f netinet/done ] ; then  (cd netinet; ln -s ../*.h .; ln -s ../ip_*_pxy.c .; );  (cd netinet; ln -s ../ipsend/tcpip.h tcpip.h);  touch netinet/done;  fi
cd: can't cd to netinet
*** Error code 2

Stop in /usr/src/contrib/ipfilter.