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 `’
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