Homebrew/linuxbrew — pull request #217 by jlisic (2014-12-23 13:41:11+00:00)
Title: Fixes to Valgrind for LinuxBrew

Conditioned the flag for `--build=amd64-darwin` on the host being OS X, otherwise the formula fails. A few OS X version checks were also conditioned on the OS being OS X, this is mainly for aesthetic reasons.