conventional location for site-updated libraries?

["Steven M. Bellovin" <smb%cs.columbia.edu@localhost>]

I working on a couple of packages that use site-updated libraries.  That
is, each site will have different subsets of the possible data; there will
also be scripts to populate the directories from available archives.  What
is the conventional location for these libraries?  /usr/pkg/share/app/foo?

                --Steven M. Bellovin, http://www.cs.columbia.edu/~smb