gem - Error in set up Rails -

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i trying learn ruby on rails. have installed ubuntu in virtualbox under host system windows 7 64 bit. have set ruby , next step want set rails. after entering command: 

sudo gem install rails

i got following messages:

fetching: minitest-4.7.5.gem (100%) fetching: atomic-1.1.13.gem (100%) building native extensions. take while... error: error installing rails: error: failed build gem native extension.

    /usr/bin/ruby1.9.1 extconf.rb

/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in require': cannot load such file -- mkmf (loaderror) /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:inrequire' extconf.rb:13:in `'

gem files remain installed in /var/lib/gems/1.9.1/gems/atomic-1.1.13 inspection. results logged /var/lib/gems/1.9.1/gems/atomic-1.1.13/ext/gem_make.out

what should solve situation? ready give additional info need. thank help.

when error, it's because forgot install ruby1.9.1-dev , make.


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