当我尝试安装 nokigiri 时，我得到以下信息，
Building native extensions. This could take a while...
ERROR: Error installing nokogiri:
ERROR: Failed to build gem native extension.
current directory: /var/lib/gems/2.4.0/gems/nokogiri-1.9.1/ext/nokogiri
/usr/bin/ruby2.4 -r ./siteconf20181224-15718-15hfw3z.rb extconf.rb
mkmf.rb can't find header files for ruby at /usr/lib/ruby/include/ruby.h
extconf failed, exit code 1
Gem files will remain installed in /var/lib/gems/2.4.0/gems/nokogiri-1.9.1 for inspection.
Results logged to /var/lib/gems/2.4.0/extensions/x86_64-linux/2.4.0/nokogiri-1.9.1/gem_make.out
我安装了这些版本的 ruby - 1.9.1、2.0.0 和 2.4.0。
安装
ruby2.4-dev完成了工作。