mxcl/homebrew — pull request #9064 by mistydemeo (2011-12-09 15:36:40+00:00)
Title: glib: find libffi without pkg-config

glib's dependency on pkg-config can be eliminated if a few environment variables are set. This needed to be updated for libffi in order to build correctly. I also updated the comment to more clearly document why we're doing this.

Fixes #9045.