mxcl/homebrew — pull request #9979 by azanar (2012-02-04 22:57:24+00:00)
Title: Adding an envvar knob to specify search paths for formulae

This allows for multiple formula repos to live independently, but for brew to still behave like they are all part of the same Formula directory. The default homebrew Formula directory is always searched.

This does not do anything about the issue of Formulas in alternate directories being a part of the blacklist; these will still need to be forced.

Open to suggestions for improvements and/or alternate approaches.