[Rails] 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

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