I think cpan installs stuff in ~/.cpan. I found perl-5.8.0 in there along with the newest bioperl that I installed. However, if I go to the perl-5.8.0 directory and try to run perl, I get this error:
./perl
dyld: ./perl can't open library: /Library/Perl/darwin/CORE/libperl.dylib (No such file or directory, errno = 2)
Trace/BPT trap
These is, in fact, no CORE directory in the /Library/Perl/darwin directory.
I've really confused myself with this one.
kman