mxcl/homebrew — pull request #20473 by felixbuenemann (2013-06-13 15:12:55+00:00)
Title: macvim: Fix compilation on Mac OS X 10.9

This is a simple compile fix for MacVim on Mac OS X 10.9 / Xcode5-DP. The required macro MAC_OS_X_VERSION_MAX_ALLOWED requires AvailabilityMacros.h to be defined.

I'm not sure this is the best approach, but it works™ with both stable and HEAD.