[email protected]:/opt/ghost-git# GEM_HOME=/opt/ghost-git/gems gem install -i /opt/ghost-git/gems/sass sass
Successfully installed sass-3.2.12
1 gem installed
Installing ri documentation for sass-3.2.12...
Installing RDoc documentation for sass-3.2.12...

[email protected]:/opt/ghost-git#  GEM_HOME=/opt/ghost-git/gems PATH=/opt/ghost-git/gems/sass/bin:/opt/ghost-git/gems/bourbon/bin:\"$PATH\" grunt
Running "sass:compress" (sass) task
/usr/lib/ruby/1.9.1/rubygems/dependency.rb:247:in `to_specs': Could not find sass (>= 0) amongst [] (Gem::LoadError)
        from /usr/lib/ruby/1.9.1/rubygems/dependency.rb:256:in `to_spec'
        from /usr/lib/ruby/1.9.1/rubygems.rb:1231:in `gem'
        from /opt/ghost-git/gems/sass/bin/sass:22:in `<main>'