brew --config

HOMEBREW_VERSION: 0.9.2
HEAD: f46569ecdbeef804c5ec38caa0d7464afda6e464
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CELLAR: /usr/local/Cellar
CPU: 8-core 64-bit nehalem
OS X: 10.6.8-i386
Xcode: 3.2.6
GCC-4.0: build 5494
GCC-4.2: build 5666
LLVM: build 2335
Clang: 1.7 build 77
MacPorts or Fink? false
X11:  @ /usr/X11
System Ruby: 1.8.7-249
Which Perl:   /usr/bin/perl
Which Python: /usr/bin/python
Which Ruby:   /Users/slippyd/.rvm/rubies/ruby-1.9.3-p125/bin/ruby => /Volumes/UserDrive/Users/slippyd/.rvm/rubies/ruby-1.9.3-p125/bin/ruby

brew doctor

Your system is raring to brew.

brew install -v gtk+3

Error: comparison of String with nil failed
Please report this bug:
    https://github.com/mxcl/homebrew/wiki/bug-fixing-checklist
/usr/local/Library/Homebrew/dependencies.rb:192:in `<='
/usr/local/Library/Homebrew/dependencies.rb:192:in `satisfied?'
/usr/local/Library/Homebrew/formula_installer.rb:70:in `install'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/set.rb:195:in `each'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/set.rb:195:in `each_key'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/set.rb:195:in `each'
/usr/local/Library/Homebrew/formula_installer.rb:69:in `install'
/usr/local/Library/Homebrew/cmd/install.rb:75:in `install_formulae'
/usr/local/Library/Homebrew/cmd/install.rb:72:in `each'
/usr/local/Library/Homebrew/cmd/install.rb:72:in `install_formulae'
/usr/local/Library/Homebrew/cmd/install.rb:20:in `install'
/usr/local/bin/brew:80:in `send'
/usr/local/bin/brew:80