mxcl/homebrew — pull request #11090 by kevwil (2012-03-20 15:43:46+00:00)
Title: add option to make valgrind happy, based on http://zguide.zeromq.org/page:all#Detecting-Memory-Leaks

Not sure about the direct dependency on valgrind, but I figured someone would need to have valgrind installed if they wanted/needed this flag to be set on zeromq.