There are a number of 3rd party apps to support CSS preprocessors
We're going to use Ruby
$ gem install bundler
Gemfile:
source "https://rubygems.org"
gem 'guard-sass'
gem 'compass'
gem 'guard-livereload'
$ bundle install
# More info at https://github.com/guard/guard#readme
guard 'sass',
:input => 'docroot/sites/all/themes/wscu_theme/scss',
:output => 'docroot/sites/all/themes/wscu_theme/css',
:compass => true,
:style => :compressed