rootじゃないのにcpan使いたい人の~/.cpan/CPAN/MyConfig.pm
via http://makeout.sakuraweb.com/archives/2006/07/02_124751.php
$CPAN::Config->{makepl_arg} = 'PREFIX=/home/USER/perl LIB=/home/USER/perl/lib INSTALLMAN1DIR=/home/USER/perl/man/man1 INSTALLMAN3DIR=/home/USER/perl/man/man3';