package-vc

While packages managed by package.el use tarballs for distributing
the source code, this extension allows for packages to be fetched
and upgraded directly from a version control system.

To install a package from source use `package-vc-install'.  If you
aren't interested in activating a package, you can use
`package-vc-checkout' instead, which will prompt you for a target
directory.

If you make local changes that you wish to share with an upstream
maintainer, the command `package-vc-prepare-patch' can prepare
these as patches to send via Email.