Failed to build gem native extension #133
Description
Hello, all
I met a snag as the following:
root@ubuntu:/home/eduOSS# gem install github-pages
Building native extensions. This could take a while...
ERROR: Error installing github-pages:
ERROR: Failed to build gem native extension.
/usr/bin/ruby2.1 -r ./siteconf20150418-11838-636jct.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/2.1.0/gems/fast-stemmer-1.0.2 for inspection.
Results logged to /var/lib/gems/2.1.0/extensions/x86_64-linux/2.1.0/fast-stemmer-1.0.2/gem_make.out
The version of Ruby installed is ruby 2.1.5p273 (2014-11-13 revision 48405) [x86_64-linux-gnu]
Could anyone please tell me why and how to tackle it? Thanks very much.