Looked into it and discovered it was a simple lack of the pyyaml python module. Should probably put that in your build instructions and have the configure script throw an error.
pip install pyyaml
fixed it for me
Ok, we've got a fix for this. We'll release 1.5.1 shortly.
It's not always 100%, but who else think homebrew is awesome?
I miss it when I go to my linux machines.
What do you miss about it?
I like Homebrew as well and I don't want to detract from how awesome it is, but dpkg + aptitude is much better in my opinion and I find I actually miss aptitude on OSX.
Thanks for the report, I've sent up the Bat-Signal for our @atnnn (our Homebrew expert) to sort this out.