“Sh: make: command not found” ao executar o “$ bundle” após adicionar a gema redcarpet ao aplicativo Rails

Recebo o seguinte ao executar "$ bundle" após adicionar "gem 'redcarpet'" ao Gemfile:

$ bundle
...
Using paperclip (2.3.11) 
Using passenger (3.0.7) 
Installing redcarpet (1.17.2) with native extensions /Users/robs/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:551:in `rescue in block in build_extensions': ERROR: Failed to build gem native extension. (Gem::Installer::ExtensionBuildError)

    /Users/robs/.rvm/rubies/ruby-1.9.2-p180/bin/ruby extconf.rb 
creating Makefile

make
sh: make: command not found

Gem files will remain installed in /Users/robs/.rvm/gems/[email protected]/gems/redcarpet-1.17.2 for inspection.
Results logged to /Users/robs/.rvm/gems/[email protected]/gems/redcarpet-1.17.2/ext/redcarpet/gem_make.out
from /Users/robs/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:529:in `block in build_extensions'
from /Users/robs/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:504:in `each'
from /Users/robs/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:504:in `build_extensions'
from /Users/robs/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:180:in `install'
from /Users/robs/.rvm/gems/ruby-1.9.2-p180@global/gems/bundler-1.0.15/lib/bundler/source.rb:101:in `block in install'
from /Users/robs/.rvm/gems/ruby-1.9.2-p180@global/gems/bundler-1.0.15/lib/bundler/rubygems_integration.rb:78:in `preserve_paths'
...
from /Users/robs/.rvm/gems/ruby-1.9.2-p180@global/gems/bundler-1.0.15/bin/bundle:13:in `<top (required)>'
from /Users/robs/.rvm/gems/[email protected]/bin/bundle:19:in `load'
from /Users/robs/.rvm/gems/[email protected]/bin/bundle:19:in `<main>'

Gist completo aqui.

Estou usando o rvm com diferentes gemas. Esta aplicação está usando o @ rails-3.0 gemset.Aqui está minha pergunta anterior em relação a essa configuração.

Notei que a linha "Instalando redcarpet (1.17.2) ..." inclui "/Users/robs/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby 1.9.1 / rubygems / installer.rb ". Isso faz parte do problema? Como posso instalar isso?

Obrigado

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