Can I tell MacHG to use a specific version of Mercurial?
Yes, it's documented in the project's source code: Replacing the Mercurial version is fairly trivial. Just replace the version of Mercurial in MacHg/LocalMercurial. Ie replace MacHg/LocalMercurial/mercurial MacHg/LocalMercurial/hgext MacHg/LocalMercurial/mercurial-<version>-py2.6.egg-info With the new version. Be careful to maintain the extensions in hgext which are not in the new version hgext. Eg histedit,...