lmullen/homebrew — comment on commit 77e1b8d2ef644bc918a7c168a1f9b7fbf23f09cd
File:  line 0
By lmullen:

I see my mistake. I was working with an out-of-date version of the `pyqt` formula, which was 4.9 rather than 4.9.1. Running `brew update` fixed my problem. Thanks, @samueljohn.