Riak build failure: 'get-deps' failed

When trying to build Riak on Mac OS X, you might encounter a failure when make is trying to build the dependencies:

ERROR: 'get-deps' failed while processing <path_to_dependency>
</path_to_dependency>

The cause (at least for me) was that accessing github via the git:// protocol doesn't work from our corporate network.

Workaround: build at home, where the git: protocol isn't blocked by the firewall.