You can clone with
HTTPS or Subversion.
Please, update to new libetpan version and include x-gm-labels support
^ This. I would help, as I'm dipping my feet into libetpan at the moment, but I have no idea where to begin for label support. Shouldn't it work like folders, but multiple folders -> one email?
Any news about this or does MailCore still lacks support for x-gm-labels?