abhishekmunie/heroku-buildpack-git — pull request #4 by gabriel-bezerra (2014-05-02 18:51:29+00:00)
Title: Add other git binaries to PATH

Some executables, e.g. git submodule, are not on PATH in the current version. This patch adds them to the PATH.

I'm not sure whether this is the right way to go, but it resolved my problem.