# File src/ruby_supportlib/phusion_passenger/platform_info/apache.rb, line 319
    def self.httpd_envvars_file(options = nil)
      if options
        httpd = options[:httpd] || self.httpd(options)
      else
        httpd = self.httpd
      end

      httpd_dir = File.dirname(httpd)
      if httpd_dir == "/usr/bin" || httpd_dir == "/usr/sbin"
        if File.exist?("/etc/apache2/envvars")
          return "/etc/apache2/envvars"
        elsif File.exist?("/etc/httpd/envvars")
          return "/etc/httpd/envvars"
        end
      end

      conf_dir = File.expand_path(File.dirname(httpd) + "/../conf")
      if File.exist?("#{conf_dir}/envvars")
        return "#{conf_dir}/envvars"
      end

      return nil
    end