ruby on rails - Error installing gem twitter on Ubuntu 15.04 -


am trying install twitter gem on ubuntu 15.04 , error keeps popping 

gem install twitter building native extensions.  take while... error:  error installing twitter:     error: failed build gem native extension.      /usr/bin/ruby2.1 extconf.rb mkmf.rb can't find header files ruby @ /usr/lib/ruby/include/ruby.h  extconf failed, exit code 1  gem files remain installed in /var/lib/gems/2.1.0/gems/http_parser.rb-0.6.0 inspection. results logged /var/lib/gems/2.1.0/extensions/x86-linux/2.1.0/http_parser.rb-0.6.0/gem_make.out

you getting error because there no ruby development environment installed. development environment needed compile ruby extensions,

you should install development first using command below:

$ sudo apt-get install ruby-dev

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