antonj/scss-mode — pull request #15 by christopherbalz (2012-12-03 09:29:26+00:00)
Title: Possible fix for dependency description (in the '.el' comments)

'gem install haml' alone did not work for me. I had to do 'gem install sass'.
Not sure if 'gem install haml' is required; scss.el original authors will likely know.