docs/packages/cli/cpan.rst
--cpan-cpanm-bin CPANM_EXECUTABLE
--[no-]cpan-cpanm-force
--cpan-mirror CPAN_MIRROR
--[no-]cpan-mirror-only
--cpan-package-name-prefix NAME_PREFIX
--cpan-perl-bin PERL_EXECUTABLE
--cpan-perl-lib-path PERL_LIB_PATH
--[no-]cpan-sandbox-non-core
--[no-]cpan-test
--[no-]cpan-verbose