Document a problem while building tbb-4.5a3-build2 (with hopes of answering soon.) ([diff](https://trac.torproject.org/projects/tor/wiki/doc/TorBrowser/BuildingWithGitian?action=diff&version=19)) URL: https://trac.torproject.org/projects/tor/wiki/doc/TorBrowser/BuildingWithGitian?version=19