gistfile1.txt

root@dev:/puppet/manifests# /usr/bin/gem install --include-dependencies --no-rdoc --no-ri ruby-shadow
INFO:  `gem install -y` is now default and will be removed
INFO:  use --ignore-dependencies to install only the gems you list
Building native extensions.  This could take a while...
ERROR:  Error installing ruby-shadow:
	ERROR: Failed to build gem native extension.

/usr/bin/ruby1.8 extconf.rb
extconf.rb:7:in `require': no such file to load -- mkmf (LoadError)
	from extconf.rb:7


Gem files will remain installed in /var/lib/gems/1.8/gems/ruby-shadow-2.1.2 for inspection.
Results logged to /var/lib/gems/1.8/gems/ruby-shadow-2.1.2/gem_make.out