/usr/lib/ruby/1.8/fileutils.rb:243:in `mkdir': Permission denied - themes (Errno::EACCES)
        from /usr/lib/ruby/1.8/fileutils.rb:243:in `fu_mkdir'
        from /usr/lib/ruby/1.8/fileutils.rb:217:in `mkdir_p'
        from /usr/lib/ruby/1.8/fileutils.rb:215:in `reverse_each'
        from /usr/lib/ruby/1.8/fileutils.rb:215:in `mkdir_p'
        from /usr/lib/ruby/1.8/fileutils.rb:201:in `each'
        from /usr/lib/ruby/1.8/fileutils.rb:201:in `mkdir_p'
        from /var/lib/gems/1.8/gems/sass-3.2.12/bin/../lib/sass/../sass/plugin/compiler.rb:356:in `update_stylesheet'
        from /var/lib/gems/1.8/gems/sass-3.2.12/bin/../lib/sass/../sass/plugin/compiler.rb:203:in `update_stylesheets'
        from /var/lib/gems/1.8/gems/sass-3.2.12/bin/../lib/sass/../sass/plugin/compiler.rb:201:in `each'
        from /var/lib/gems/1.8/gems/sass-3.2.12/bin/../lib/sass/../sass/plugin/compiler.rb:201:in `update_stylesheets'
        from /var/lib/gems/1.8/gems/sass-3.2.12/bin/../lib/sass/../sass/plugin.rb:81:in `update_stylesheets'
        from /var/lib/gems/1.8/gems/sass-3.2.12/bin/../lib/sass/../sass/exec.rb:443:in `watch_or_update'
        from /var/lib/gems/1.8/gems/sass-3.2.12/bin/../lib/sass/../sass/exec.rb:326:in `process_result'
        from /var/lib/gems/1.8/gems/sass-3.2.12/bin/../lib/sass/../sass/exec.rb:41:in `parse'
        from /var/lib/gems/1.8/gems/sass-3.2.12/bin/../lib/sass/../sass/exec.rb:21:in `parse!'
        from /var/lib/gems/1.8/gems/sass-3.2.12/bin/sass:9
        from /usr/local/bin/sass:19:in `load'
        from /usr/local/bin/sass:19