cpan[1]> o conf /mbuild/
$CPAN::Config options from /opt/app/d1cap1w6/.cpan/CPAN/MyConfig.pm:

    mbuild_arg         [--install_base /opt/app/d1car1m6/.perl]
    mbuild_install_arg []
    mbuild_install_build_command [./Build]
    mbuildpl_arg       [--installdirs=site --install_base=/opt/app/d1cap1w6/.perl]