gistfile1.txt

$ brew reinstall mono
==> Reinstalling mono
==> Downloading https://homebrew.bintray.com/bottles/mono-3.12.1.yosemite.bottle.tar.gz
Already downloaded: /Library/Caches/Homebrew/mono-3.12.1.yosemite.bottle.tar.gz
==> Pouring mono-3.12.1.yosemite.bottle.tar.gz
==> Caveats
To use the assemblies from other formulae you need to set:
  export MONO_GAC_PREFIX="/usr/local"
==> Summary
🍺  /usr/local/Cellar/mono/3.12.1: 1131 files, 219M
$ mono --version
Mono JIT compiler version 3.12.1 (tarball Tue Mar 17 15:03:14 GMT 2015)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
	TLS:           normal
	SIGSEGV:       altstack
	Notification:  kqueue
	Architecture:  amd64
	Disabled:      none
	Misc:          softdebug
	LLVM:          supported, not enabled.
	GC:            sgen