$ perl -MCPAN -e shell
cpan[1]> o conf
...
    makepl_arg         [INSTALLMAN3DIR=/home/dthroop/lib/perl/man/man3]
    mbuild_arg         [INSTALLMAN3DIR=/home/dthroop/lib/perl/man/man3]
    mbuild_install_arg [INSTALLMAN3DIR=/home/dthroop/lib/perl/man/man3]
    mbuildpl_arg       [--lib=/home/dthroop/lib/perl --installman1dir=/home/dthroop/lib/perl/man/man1 --installman3dir=/home/dthroop/lib/perl/man/man3 --installscript=/home/dthroop/lib/perl/bin --installbin=/home/dthroop/lib/perl/bin]

...