mxcl/homebrew — pull request #15542 by royhodgman (2012-10-19 05:48:45+00:00)
Title: mapnik: add libtool dependency for mountain lion build

According to [the mac homebrew installation wiki page for mapnik][1], libtool needs to be installed before mapnik when installing on mountain lion.

[1]: https://github.com/mapnik/mapnik/wiki/MacInstallation_Homebrew