Very new to Ruby/Rails, followed the download/install instructions, until
this step:
> gem install rails
Building native extensions. This could take a while...
ERROR: Error installing rails:
ERROR: Failed to build gem native extension.
/usr/bin/ruby1.9.1 extconf.rb
/usr/local/lib/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require':
cannot load such file -- mkmf (LoadError)
from
/usr/local/lib/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
from extconf.rb:1:in `<main>'
Gem files will remain installed in /usr/lib/ruby/gems/1.9.1/gems/json-1.7.6
for inspection.
Results logged to
/usr/lib/ruby/gems/1.9.1/gems/json-1.7.6/ext/json/ext/generator/gem_make.out
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