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As a background, here's my environment: vishal@dishDell:~$ gem env RubyGems Environment: - RUBYGEMS VERSION: 1.8.24 - RUBY VERSION: 1.9.3 (2011-10-30 patchlevel 0) [x86_64-linux] - INSTALLATION DIRECTORY: /usr/lib/ruby/gems/1.9.1 - RUBY EXECUTABLE: /usr/bin/ruby1.9.1 - EXECUTABLE DIRECTORY: /usr/bin - RUBYGEMS PLATFORMS: - ruby - x86_64-linux - GEM PATHS: - /usr/lib/ruby/gems/1.9.1 - /home/vishal/.gem/ruby/1.9.1 - GEM CONFIGURATION: - :update_sources => true - :verbose => true - :benchmark => false - :backtrace => false - :bulk_threshold => 1000 - REMOTE SOURCES: - http://rubygems.org/ This is what happens when I try running gem install rails . vishal@dishDell:~$ sudo gem install rails [sudo] password for vishal: 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-1.7.3 for inspection. Results logged to /usr/lib/ruby/gems/1.9.1/gems/json-1.7.3/ext/json/ext/parser/gem_make.out I installed Ruby 1.9.3 using apt-get , and I installed RubyGems from a tarball at rubygems.org. What should I do to get this to work?

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