ensure_specs_are_compatible!

# File lib/bundler/installer.rb, line 243
    def ensure_specs_are_compatible!
      system_ruby = Bundler::RubyVersion.system
      rubygems_version = Gem::Version.create(Gem::VERSION)
      @definition.specs.each do |spec|
        if required_ruby_version = spec.required_ruby_version
          unless required_ruby_version.satisfied_by?(system_ruby.gem_version)
            raise InstallError, "#{spec.full_name} requires ruby version #{required_ruby_version}, "                "which is incompatible with the current version, #{system_ruby}"
          end
        end
        next unless required_rubygems_version = spec.required_rubygems_version
        unless required_rubygems_version.satisfied_by?(rubygems_version)
          raise InstallError, "#{spec.full_name} requires rubygems version #{required_rubygems_version}, "              "which is incompatible with the current version, #{rubygems_version}"
        end
      end
    end