could not load library plperl.so

I configured postgres base+opt with '--with-perl',
make'd, and make install'ed. Trying to add plperl:

createlang -U postgres plperl links

I get this error:

createlang: language installation failed: ERROR:
could not load library
"/usr/lib/postgresql/plperl.so": libperl.so: cannot
open shared object file: No such file or directory

plperl.so does exist in /usr/lib/postgresql
(libperl.so does not). I also compiled in plpython,
and createlang appeared to work for that. Any idea
what the problem is?

Thanks,
CSN

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