hey everyone! error: unknown warning option '-Werror=unused-but-set-variable'; did you mean '-Werror=unused-const-variable'? [-Werror,-Wunknown-warning-option] is the key bit, seems like apple clang bundled with xcode 6 doesn't have that option thoughts? (do we need to do some auto conf magic to support more clang variants?) this gist provides a bit more context https://gist.github.com/cartazio/ac04ab8048c9f7577d3d thanks! -Carter