RubyGem FPM中的误差

Question

我正在尝试格拉法纳，我正在跟踪它的使用说明，以便从源代码构建它。

尽管当我开始创建优化的发布包时，在安装FPM (v.1.4.0)之后，我仍然会得到相同的错误：

$ fpm
/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require': no such file to load -- ffi (LoadError)
    from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
    from /usr/lib/ruby/gems/1.8/gems/fpm-1.4.0/lib/fpm/util.rb:3
    from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
    from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
    from /usr/lib/ruby/gems/1.8/gems/fpm-1.4.0/lib/fpm/package.rb:2
    from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
    from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
    from /usr/lib/ruby/gems/1.8/gems/fpm-1.4.0/lib/fpm.rb:3
    from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
    from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
    from /usr/lib/ruby/gems/1.8/gems/fpm-1.4.0/bin/fpm:5
    from /usr/bin/fpm:19:in `load'
    from /usr/bin/fpm:19

知道可能是什么吗？我在一台RedHat EL6 64位机上。

Answer 1

经过大量搜索和反复尝试之后，我通过以下命令找到了解决问题的方法：

gem安装--http_proxy http://username:password@proxy fpm

问题在于如何正确使用gem命令，以便绕过我公司的代理并获取FPM的所有依赖项。