Json, unable to build gem native extension error in windows

I am working in a rails 3.1 app. My Gemfile is not having any json gem version specified, still one of the gem is having a dependency in json, which was resulting in the error above, I have tried

• Devkit 
• changing the Rubygems version
• using ruby 1.8.7 and ruby 1.9.2 both, using pik

But neither of them worked in windows. Then I started my app in VMware+ubuntu and it worked like miracle. So it's a windows issue try installing ubuntu with a virtual machine in your windows and start a hassle free coding in rails :)