title: While installing http_parser.rb ERROR: Failed to build gem native extension
body: <p>i'm new to all of this but i get this error when i try to install http_parser using gem:</p>
  
  <pre><code>dongl_000@LENNY ~/ava-home (master)
  $ gem install http_parser.rb -v '0.6.0'
  Building native extensions.  This could take a while...
  ERROR:  Error installing http_parser.rb:
          ERROR: Failed to build gem native extension.
  
      c:/Ruby22-x64/bin/ruby.exe -r ./siteconf20160217-15056-1hoiyfc.rb extconf.rb
  
  creating Makefile
  
  make "DESTDIR=" clean
  
  make "DESTDIR="
  generating ruby_http_parser-x64-mingw32.def
  make: *** No rule to make target '/c/Ruby22-x64/include/ruby-2.2.0/ruby.h', need
  ed by 'ruby_http_parser.o'.  Stop.
  
  make failed, exit code 2
  
  Gem files will remain installed in c:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/http_p
  arser.rb-0.6.0 for inspection.
  Results logged to c:/Ruby22-x64/lib/ruby/gems/2.2.0/extensions/x64-mingw32/2.2.0
  /http_parser.rb-0.6.0/gem_make.out
  </code></pre>
  
  <p>ruby version: 2.2.1</p>
  
  <p>rubyGem version: 2.4.5</p>
  
  <p>Thank you!</p>