Error

An error occurred while installing json (1.8.1), and Bundler cannot continue.
Make sure that `gem install json -v '1.8.1'` succeeds before bundling.
Rickyss-iMac:twitterrr sammiepagden$ gem install json -v 1.8.1
Building native extensions.  This could take a while...
ERROR:  Error installing json:
	ERROR: Failed to build gem native extension.

        /usr/local/rvm/rubies/ruby-1.9.3-p194/bin/ruby extconf.rb
creating Makefile

make
compiling generator.c
make: gcc-4.2: No such file or directory
make: *** [generator.o] Error 1


Gem files will remain installed in /usr/local/rvm/gems/ruby-1.9.3-p194/gems/json-1.8.1 for inspection.
Results logged to /usr/local/rvm/gems/ruby-1.9.3-p194/gems/json-1.8.1/ext/json/ext/generator/gem_make.out