请帮帮我.我尝试安装gem nio4r,但是这个日志有错误:
ERROR: Error installing nio4r:
ERROR: Failed to build gem native extension.
current directory: /var/lib/gems/2.3.0/gems/nio4r-1.2.1/ext/nio4r
/usr/bin/ruby2.3 -r ./siteconf20161020-13985-1c6zxok.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/2.3.0/gems/nio4r-1.2.1 for inspection.
Results logged to /var/lib/gems/2.3.0/extensions/x86_64-linux/2.3.0/nio4r-1.2.1/gem_make.out
我有ubuntu 16.04,ruby 2.3.0,rails 5.0.0.1.
(与其他一些宝石我有类似的错误(宝石bcrypt))
我必须做些什么来修复这个bug？谢谢!