Homebrew output when building valgrind on Yosemite.

homebrew_yosemite_valgrind.txt

~ → brew install valgrind
valgrind: OS X Mavericks or older is required for stable.
Use `brew install devel or --HEAD` for newer.
Error: An unsatisfied requirement failed this build.
~ → brew edit valgrind
~ → brew install valgrind
==> Downloading http://valgrind.org/downloads/valgrind-3.10.0.tar.bz2
######################################################################## 100.0%
==> Downloading https://gist.githubusercontent.com/jacknagel/369bedc191e0a0795358/raw/a71e6c0fdcb786fdfde2fc33d71d555b18
######################################################################## 100.0%
==> Patching
patching file coregrind/Makefile.in
patching file coregrind/link_tool_exe_darwin.in
==> ./configure --prefix=/usr/local/Cellar/valgrind/3.10.0 --enable-only64bit --build=amd64-darwin
checking for a 64-bit only build... yes
checking for a 32-bit only build... no
checking for a supported OS... ok (darwin)
checking for the kernel version... unsupported (14.0.0)
configure: error: Valgrind works on Darwin 10.x, 11.x, 12.x and 13.x (Mac OS X 10.6/7/8/9)

READ THIS: https://github.com/Homebrew/homebrew/wiki/troubleshooting