качаешь патч
# ftp ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-04:16/fetch.patch
# ftp
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-04:16/fetch.patch.asc
# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/usr.bin/fetch
# make obj && make depend && make && make install