# cd /usr/ports/sysutils/lsof
# make install
>> lsof_4.88D.freebsd.tar.gz doesn't seem to exist in /usr/ports/distfiles/.
>> Attempting to fetch from ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/.
===> Extracting for lsof-4.88
...
[extraction output snipped]
...
>> Checksum OK for lsof_4.88D.freebsd.tar.gz.
===> Patching for lsof-4.88.d,8
===> Applying FreeBSD patches for lsof-4.88.d,8
===> Configuring for lsof-4.88.d,8
...
[configure output snipped]
...
===> Building for lsof-4.88.d,8
...
[compilation output snipped]
...
===> Installing for lsof-4.88.d,8
===> Installing for lsof-4.88.d,8
...
[installation output snipped]
...
===> Generating temporary packing list
===> Compressing manual pages for lsof-4.88.d,8
===> Registering installation for lsof-4.88.d,8
===> SECURITY NOTE:
This port has installed the following binaries which execute with
increased privileges.
/usr/local/sbin/lsof
#