mxcl/homebrew — pull request #20474 by clemensg (2013-06-13 15:22:16+00:00)
Title: homebrew: fix superenv bug on mavericks. 

same solution as on mountain lion, changed to also cover mavericks

fixes serf bug #20417

details: apr-1-config is not only messed up on 10.8, it is the same situation on 10.9
therefore I guess >= 10.8 is the right choice