Installing linecache19 (0.5.12) with native extensions

Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

        /usr/bin/ruby extconf.rb
mkmf.rb can't find header files for ruby at /usr/share/include/ruby.h


Gem files will remain installed in /home/dadavis/.gem/ruby/1.9.1/gems/linecache19-0.5.12 for inspection.
Results logged to /home/dadavis/.gem/ruby/1.9.1/gems/linecache19-0.5.12/ext/trace_nums/gem_make.out
An error occurred while installing linecache19 (0.5.12), and Bundler cannot continue.
Make sure that `gem install linecache19 -v '0.5.12'` succeeds before bundling.
dadavis@dhcp231-107 ~k (master*) %
dadavis@dhcp231-107 ~k (master*) % vim /home/dadavis/.gem/ruby/1.9.1/gems/linecache19-0.5.12/ext/trace_nums/gem_make.out
dadavis@dhcp231-107 ~k (master*) % cat /home/dadavis/.gem/ruby/1.9.1/gems/linecache19-0.5.12/ext/trace_nums/gem_make.out
/usr/bin/ruby extconf.rb
mkmf.rb can't find header files for ruby at /usr/share/include/ruby.h