Recibo una respuesta muy extraña cuando intento instalar ImageMagick a través de Homebrew.

Me está dando esto:

Holger-Sindbaeks-MacBook-Air:showwwdown_0.3 holgersindbaek$ brew install imagemagick

Error: undefined method `=~' for #<Pathname:/usr/local/Library/Formula/jpeg.rb>
Please report this bug:
    https://github.com/mxcl/homebrew/wiki/checklist-before-filing-a-new-issue
/usr/local/Library/Homebrew/formula.rb:426:in `factory'
/usr/local/Library/Homebrew/formula_installer.rb:38:in `block (2 levels) in install'
/usr/local/Library/Homebrew/extend/ARGV.rb:121:in `filter_for_dependencies'
/usr/local/Library/Homebrew/formula_installer.rb:34:in `block in install'
/usr/local/Library/Homebrew/formula_installer.rb:30:in `each'
/usr/local/Library/Homebrew/formula_installer.rb:30:in `install'
/usr/local/Library/Homebrew/cmd/install.rb:103:in `block in install_formulae'
/usr/local/Library/Homebrew/cmd/install.rb:86:in `each'
/usr/local/Library/Homebrew/cmd/install.rb:86:in `install_formulae'
/usr/local/Library/Homebrew/cmd/install.rb:24:in `install'
/usr/local/bin/brew:83:in `<main>'

No me dice absolutamente nada y no sé cuál podría ser el siguiente paso. ¿Tienes alguna idea

Estoy corriendo en Mac OSX 10.6 y Ruby 1.9.2