rails 3.1 gemfile issues

my system running with rails3.1 version, which i am using for 3 months. But when i create a new application ,Every time i have to changed the Gemfile of that application , that means i have to add this two line
gem 'execjs’

gem 'therubyracer’

how to avoid this problem…?

thank you

vishnu

Use app templates:
http://guides.rubyonrails.org/generators.html#application-templates