Nginx compass在www数据用户环境下编译

我需要从nginx/php5 fpm通过

www-data

用户编译scs

命令：

compass compile sass/screen.scss --config config.rb --boring

结果:

/usr/local/rvm/rubies/ruby-2.1.3/lib/ruby/2.1.0/rubygems/dependency.rb:298:in `to_specs': Could not find 'compass' (>= 0) among 14 total gem(s) (Gem::LoadError)
    from /usr/local/rvm/rubies/ruby-2.1.3/lib/ruby/2.1.0/rubygems/dependency.rb:309:in `to_spec'
    from /usr/local/rvm/rubies/ruby-2.1.3/lib/ruby/2.1.0/rubygems/core_ext/kernel_gem.rb:53:in `gem'
    from /usr/bin/compass:22:in `<main>'
    from /usr/bin/ruby_executable_hooks:15:in `eval'
    from /usr/bin/ruby_executable_hooks:15:in `<main>'

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看起来没有安装指南针宝石。试着跑步

gem install compass

---

www数据用户是否也已安装/可用？也许www数据使用不同的ruby版本和不同的gems？gemlistcmd是否作为www数据返回包含compass的列表运行？

gem install compass