cpan> o conf makepl_arg "INSTALLBIN=/usr/local/bin INSTALLSCRIPT=/usr/local/bin"

cpan> o conf commit


##</code><code>##

$ sudo find / -type f -name CPAN.pm

/System/Library/Perl/5.8.6/CPAN.pm
/Users/me/.cpan/Bundle/CPAN.pm   <----HERE***
/Users/me/my_tar_extractions/perl-5.10.1/lib/CPAN.pm
/usr/local/lib/perl5/5.10.1/CPAN.pm