root@dhcdev# portsclean -L
[Rebuilding the pkgdb <format:bdb1_btree> in /var/db/pkg ... - 98 packages found (-0 +98) .................................................................................................. done]
** Clean out /usr/local/lib/compat/pkg manually on occasions.
** Try using libchk(1) (sysutils/libchk) to find out unreferenced libraries.

root@dhcdev# libchk
Will look into:
        /bin
        /lib
        /sbin
        /usr/bin
        /usr/games
        /usr/lib
        /usr/libexec
        /usr/local/bin
        /usr/local/lib
        /usr/local/libexec
        /usr/local/sbin
        /usr/sbin
Unresolvable link(s) found in: /usr/local/lib/perl5/site_perl/5.8.6/mach/auto/DBD/mysql/mysql.so
        libmysqlclient.so.12
Unreferenced library: /lib/libgpib.so.0
Unreferenced library: /usr/lib/libc_r.so.5
Unreferenced library: /usr/lib/libform.so.2
Unreferenced library: /usr/lib/libg2c.so.1
Unreferenced library: /usr/lib/libhistory.so.5
Unreferenced library: /usr/lib/liblwres.so.3
Unreferenced library: /usr/lib/libmenu.so.2
Unreferenced library: /usr/lib/libmilter.so.2
Unreferenced library: /usr/lib/libpanel.so.2
Unreferenced library: /usr/lib/libthr.so.1
Unreferenced library: /usr/lib/libthread_db.so.1
Unreferenced library: /usr/lib/libvgl.so.3
Unreferenced library: /usr/lib/libxpg4.so.3
Unreferenced library: /usr/local/lib/libasprintf.so.0
Unreferenced library: /usr/local/lib/libcharset.so.1
Unreferenced library: /usr/local/lib/libgettextpo.so.1