Debian StretchにRailsがすんなり入らない時のメモ - Qiitaこの後OSに死ぬほど怒られた mkmf.rb can't find header files for ruby at /usr/lib/ruby/include/ruby.h で怒られる 事象 $ sudo gem install rails Building native extensions. This could take a while... ERROR: Error installing rails: ERROR: Failed to build gem native extension. current directory: /var/lib/gems/2.3.0/gems/nokogiri-1.8.0/ext/nokogiri /usr/bin/ruby2.3 -r ./siteconf20170814-1797-1ktxt56.rb extconf.rb mkmf.rb c
