brew-config

$ brew --config
HOMEBREW_VERSION: 0.9.5
ORIGIN: git://github.com/mxcl/homebrew.git
HEAD: 4ed26b20f4f508c4d5254f452bcaeadb32bf3ede
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CELLAR: /usr/local/Cellar
CPU: 8-core 64-bit sandybridge
OS X: 10.9-x86_64
Xcode: 5.0.1
LLVM-GCC: N/A
Clang: 5.0 build 500
X11: N/A
System Ruby: 1.8.7-358
Perl: /usr/bin/perl
Python: /usr/bin/python
Ruby: /usr/bin/ruby => /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby

brew-doctor

$ brew doctor
Warning: You are using Mac OS X 10.9.
We do not yet provide support for this (unreleased) version.

brew-install

$ brew install -v percona-server 2>&1
Error: undefined method `default_cxx_stdib' for MacOS:Module
Please report this bug:
    https://github.com/mxcl/homebrew/wiki/troubleshooting
/usr/local/homebrew/Library/Homebrew/build.rb:145:in `install'
/usr/local/homebrew/Library/Homebrew/build.rb:45:in `main'
/usr/local/homebrew/Library/Homebrew/build.rb:12
/usr/local/homebrew/Library/Formula/percona-server.rb:136

clang-version

$ clang --version
Apple LLVM version 5.0 (clang-500.2.78) (based on LLVM 3.3svn)
Target: x86_64-apple-darwin13.0.0
Thread model: posix

$ xcrun clang --version
Apple LLVM version 5.0 (clang-500.2.78) (based on LLVM 3.3svn)
Target: x86_64-apple-darwin13.0.0
Thread model: posix