title: JSON Gem fails to build on Windows
body: <p>Okay, got a pretty basic Ruby 1.9.3 install with DevKit on Windows XP.</p>
  
  <p>When I try to do a <code>rails new myapp</code>, it gets to installing json and dies.</p>
  
  <pre><code>Installing json (1.7.5) with native extensions C:\devkit\bin\make.exe: *** Couldn't reserve space for cygwin's heap, Win32 error 6
  
  Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
  
          C:/Ruby193/bin/ruby.exe extconf.rb
  creating Makefile
  
  make
        0 [main] us 0 init_cheap: VirtualAlloc pointer is null, Win32 error 487
  AllocationBase 0x0, BaseAddress 0x60E90000, RegionSize 0x170000, State 0x10000
  C:\devkit\bin\make.exe: *** Couldn't reserve space for cygwin's heap, Win32 error 6
  
  
  Gem files will remain installed in C:/Ruby193/lib/ruby/gems/1.9.1/gems/json-1.7.5 for inspection.
  Results logged to C:/Ruby193/lib/ruby/gems/1.9.1/gems/json-1.7.5/ext/json/ext/generator/gem_make.out
  An error occured while installing json (1.7.5), and Bundler cannot continue.
  Make sure that `gem install json -v '1.7.5'` succeeds before bundling.
  </code></pre>
  
  <p>I tried installing manually and a couple versions older, but no dice. Also updated my devkit to the latest version from RubyInstaller.org in case that was the issue, but no luck there either</p>