Gem Install JSON failed

#gem install json-v ' 1.8.3 'Building native extensions. This could take a while...        Error:error installing json:ERROR:Failed to build gem native extension. /usr/bin/ruby1.9.1extconf.rb/USR/LIB/RUBY/1.9.1/RUBYGEMS/CUSTOM_REQUIRE.RB:36:inch' Require': Cannot load such file--MKMF (Loaderror)     from/USR/LIB/RUBY/1.9.1/RUBYGEMS/CUSTOM_REQUIRE.RB:36:inch' Require'     fromExtconf.rb:1:inch' <main>'Gem files would remain installedinch/var/lib/gems/1.9.1/gems/json-1.8.3 forinspection. Results logged to/var/lib/gems/1.9.1/gems/json-1.8.3/ext/json/ext/generator/gem_make.out

The way to solve the problem is

# sudo apt-get install Ruby-dev

Or

Yum Install Ruby-devel

Gem Install JSON failed