As long as Less and Less-plugin installed in global, this is not necessary for deploying

Gemfile

@@ -3,7 +3,7 @@ source 'https://rubygems.org'
 gem 'jekyll', '~> 1.0'
 gem 'safe_yaml', '~> 1.0.4'
 gem 'sass', '~> 3.0'
-gem 'less', '~> 2.6.0'
+# gem 'less', '~> 2.6.0'
 gem 'libv8', '~> 3.16.14.0'
 gem 'therubyracer'
 gem 'fontcustom'