mxcl/homebrew — pull request #14643 by afb (2012-09-02 16:53:50+00:00)
Title: Py2cairo 1.10 fails on Snow Leopard

Apparently the version included in /usr/X11 is too old:

Checking for 'cairo' >= 1.10.0 : not found

Make sure to put cairo (and pixman) ahead in the path.