hgk with MacPorts
If you use mercurial from MacPorts, you need the following in your ~/.hgrc to enable the hgk extension (GUI tree browser, invoked with hg view):
[extensions]
hgk=
[hgk]
path=/opt/local/share/mercurial/contrib/hgk
While you’re in there, enable the mq, fetch, and record extensions.