when installing bundle install error of therubyracer

i have install nodejs on ubuntu 14.04 ..but when installing bundle install i have get error

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

An error occurred while installing therubyracer (0.12.2), and Bundler cannot continue. Make sure that gem install therubyracer -v '0.12.2' succeeds before bundling.