Cannot depoy code from github that uses log4php

We installed the Facebook SDK using composer, which in turn installed log4php. We use github to manage all repositories. When we try to deploy new code to a dev or production server, the log4php folder in vendor/apache/log4php is always empty.

We do not need log4php installed as a git repository, but we don't want to have to manage the Facebook dependencies manually. What steps have to be taken to configure a repository using log4php so that the code is included when a repository is cloned or fetched into a production environment?