http://www.perlmonks.org?node_id=1214600


in reply to Linking CPAN modules to specific library

In the Linux world, libraries are listed in /etc/ld.so.conf and indexed by /sbin/ldconfig. Your predecessor might have fiddled with those directory-lists as well, doing non-standard things. If you change the conf file, you must re-run the indexer (as root).