Obsolete Shared Libraries?

[Walter Hurry]

9.1 RC3 (started out as 9.0 RELEASE)

Over time, as ports have been upgraded, I seem to have accumulated a 
number of obsolete shared libraries - a recent example being /usr/local/
lib/libpcre.so.1, which appears no longer to be linked in by anything, 
having been replaced by libpcre.so.3.

Is there a convenient and safe utility to clean out this detritus? I'm 
not trying to save disk space or anything; it's just a matter of tidiness.