redcar install error

gistfile1.txt

> brew install redcar
/usr/bin/git
==> Cloning git://github.com/danlucraft/redcar.git
Updating /Users/admin/Library/Caches/Homebrew/redcar--git
You need the RSpec gem installed under JRuby or this will not work.
==> jruby bin/redcar install
==> jruby -S rake build
(in /private/tmp/homebrew-redcar-HEAD-nLMT)
rake aborted!
RubyGem version error: rspec(2.5.0 not < 2.0)
/private/tmp/homebrew-redcar-HEAD-nLMT/Rakefile:6
(See full trace by running task with --trace)
==> Exit Status: 1
http://github.com/mxcl/homebrew/blob/master/Library/Formula/redcar.rb#L14
==> Environment
HOMEBREW_VERSION: 0.8
HEAD: (none)
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CELLAR: /usr/local/Cellar
HOMEBREW_REPOSITORY: /usr/local
HOMEBREW_LIBRARY_PATH: /usr/local/Library/Homebrew
Hardware: dual-core 64-bit penryn
OS X: 10.6.6
Kernel Architecture: i386
Ruby: 1.8.7-174
/usr/bin/ruby => /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
Xcode: 4.0
GCC-4.0: N/A 
GCC-4.2: build 5666 
LLVM: build 2335 
MacPorts or Fink? false
X11 installed? true
==> Build Flags
CC: /usr/bin/cc => /usr/llvm-gcc-4.2/bin/llvm-gcc-4.2
CXX: /usr/bin/c++ => /usr/bin/c++-4.2
LD: /usr/bin/cc => /usr/llvm-gcc-4.2/bin/llvm-gcc-4.2
CFLAGS: -O3 -march=core2 -msse4.1 -w -pipe
CXXFLAGS: -O3 -march=core2 -msse4.1 -w -pipe
MAKEFLAGS: -j2

Error: Failed executing: jruby -S rake build 
Please report this bug: https://github.com/mxcl/homebrew/wiki/new-issue

Also try:
  `brew doctor` to check your setup for common problems.
  `brew missing` to check installed packages for missing deps.