installation of cpanm failed, because github certificate is unknown on centos 6.4 (minimal installation)

if i have curl and wget installed, and perlbrew choose wget to install software it fails installing cpanm. Because the github certificate is unknown. (even with ca-certificates package installed)

I don't know if it is a good option to add this. Maybe it is better to have a perlbrew command line switch to disable certificate check?

* added --no-check-certificate to wget options