title: bundle install fails due to missing make command
body: <p>I'm attempting to run "bundle install".  I've already installed the Ruby devkit and have it added to my path.  It complains about make not being a recognized command.  Isn't that what devkit is supposed to add?  When searching for answers to this issue, every answer seems to be "install devkit".  I'm on Windows 7, what would be the easiest way to configure my environment to allow it to build gems?</p>
  
  <p>I receive the following output:</p>
  
  <pre><code>$ bundle install
  Fetching source index for http://rubygems.org/
  Using rake (0.8.7)
  Using activesupport (2.3.11)
  Using rack (1.1.0)
  Using actionpack (2.3.11)
  Using actionmailer (2.3.11)
  Using activerecord (2.3.11)
  Using activeresource (2.3.11)
  Using annotate (2.4.0)
  Using authlogic (2.1.6)
  Using columnize (0.3.2)
  Using haml (3.0.25)
  Using compass (0.10.6)
  Using configuration (1.2.0)
  Using daemons (1.0.10)
  Using declarative_authorization (0.5.2)
  Using delayed_job (2.0.7)
  Using i18n (0.5.0)
  Using faker (0.9.5)
  Using mocha (0.9.12)
  Using will_paginate (2.3.15)
  Using haml_scaffold (1.1.0)
  Installing json (1.4.6) with native extensions c:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/installer.rb:483:in `build_extensions': ERROR: Failed to build gem native extension. (Gem::Installer::ExtensionBuildError)
  
  c:/Ruby187/bin/ruby.exe extconf.rb
  checking for re.h... yes
  creating Makefile
  
  make
  'make' is not recognized as an internal or external command,
  operable program or batch file.
  
  
  Gem files will remain installed in c:/Ruby187/lib/ruby/gems/1.8/gems/json-1.4.6 for inspection.
  Results logged to c:/Ruby187/lib/ruby/gems/1.8/gems/json-1.4.6/ext/json/ext/generator/gem_make.out
          from c:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/installer.rb:446:in `each'
          from c:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/installer.rb:446:in `build_extensions'
          from c:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/installer.rb:198:in `install'
          from c:/Ruby187/lib/ruby/gems/1.8/gems/bundler-1.0.11/lib/bundler/source.rb:96:in `install'
          from c:/Ruby187/lib/ruby/gems/1.8/gems/bundler-1.0.11/lib/bundler/installer.rb:55:in `run'
          from c:/Ruby187/lib/ruby/gems/1.8/gems/bundler-1.0.11/lib/bundler/spec_set.rb:12:in `each'
          from c:/Ruby187/lib/ruby/gems/1.8/gems/bundler-1.0.11/lib/bundler/spec_set.rb:12:in `each'
          from c:/Ruby187/lib/ruby/gems/1.8/gems/bundler-1.0.11/lib/bundler/installer.rb:44:in `run'
          from c:/Ruby187/lib/ruby/gems/1.8/gems/bundler-1.0.11/lib/bundler/installer.rb:8:in `install'
          from c:/Ruby187/lib/ruby/gems/1.8/gems/bundler-1.0.11/lib/bundler/cli.rb:226:in `install'
          from c:/Ruby187/lib/ruby/gems/1.8/gems/bundler-1.0.11/lib/bundler/vendor/thor/task.rb:22:in `send'
          from c:/Ruby187/lib/ruby/gems/1.8/gems/bundler-1.0.11/lib/bundler/vendor/thor/task.rb:22:in `run'
          from c:/Ruby187/lib/ruby/gems/1.8/gems/bundler-1.0.11/lib/bundler/vendor/thor/invocation.rb:118:in `invoke_task'
          from c:/Ruby187/lib/ruby/gems/1.8/gems/bundler-1.0.11/lib/bundler/vendor/thor.rb:246:in `dispatch'
          from c:/Ruby187/lib/ruby/gems/1.8/gems/bundler-1.0.11/lib/bundler/vendor/thor/base.rb:389:in `start'
          from c:/Ruby187/lib/ruby/gems/1.8/gems/bundler-1.0.11/bin/bundle:13
          from c:/Ruby187/bin/bundle:19:in `load'
          from c:/Ruby187/bin/bundle:19
  </code></pre>
  
  <p>Gemfile:</p>
  
  <pre><code>source 'http://rubygems.org'
  
  gem 'rails', '2.3.11'
  gem 'paper_trail', '~&gt; 1'
  gem 'will_paginate', '~&gt; 2.3.11'
  gem 'paperclip', '~&gt; 2.3'
  gem 'haml'
  gem 'compass', '&gt;= 0.10.6'
  gem 'authlogic'
  gem 'declarative_authorization'
  gem 'delayed_job', '~&gt; 2.0.4'
  
  group :development, :test do
    gem 'heroku'
    gem 'sqlite3'
    gem 'heroku_san'
    gem 'ruby-debug'
    gem 'faker'
    gem 'rcov'
    gem 'annotate'
    gem 'mocha'
    gem 'haml_scaffold'
  end
  
  group :production do
    # TODO
  end
  </code></pre>