I am using a Raspberry Pi B 2 running Rasbian. It came with Ruby preinstalled on the card. I would like to install the ruby gem Gosu, but even with the internet working it still won't download and install the gem.
Fetching: gosu-0.13.3.gem (100%) Building native extensions. This could take a while... ERROR: Error installing gosu: ERROR: Failed to build gem native extension. /usr/bin/ruby2.1 extconf.rb The Gosu gem requires some libraries to be installed system-wide. See the following site for a list: mkmf.rb can\'t find header files for ruby at /usr/lib/ruby/include/ruby.h https://github.com/gosu/gosu/wiki/Getting-Started-on-Linux extconf failed, exit code 1 Gem files will remain installed in /var/lib/gems/2.1.0/gems/gosu-0.13.3 for inspection. Results logged to /var/lib/gems/2.1.0/extensions/arm- linux/2.1.0/gosu-0.13.3/gem_make.out
What can I do to fix this?