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Installing Cucumber on Ubuntu - cannot load such file -- mkmf (LoadError) message

This week, I'm doing Ruby training using Ubuntu Linux ... and I'm running (at customer's request) in a heaviliy Behaviour Driven Development mode using Cucumber. This note is to share with an installation problem ... easily fixed once you know how.

Problem:

  root@caerphilly:~# gem install cucumber
  Fetching: builder-3.2.2.gem (100%)
  Fetching: diff-lcs-1.2.5.gem (100%)
  Fetching: multi_json-1.10.1.gem (100%)
  Fetching: gherkin-2.12.2.gem (100%)
  Building native extensions. This could take a while...
  ERROR: Error installing cucumber:
    ERROR: Failed to 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)
    from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from extconf.rb:1:in `<main>'
  
  
  Gem files will remain installed in /var/lib/gems/1.9.1/gems/gherkin-2.12.2 for inspection.
  Results logged to /var/lib/gems/1.9.1/gems/gherkin-2.12.2/ext/gherkin_lexer_ar/gem_make.out
  root@caerphilly:~#


Solution:

you need the development environment for Ruby - for the Ubuntu version I'm using, the extra is
  apt-get install ruby1.9.1-dev
and then these two work nicely
  gem install cucumber
  gem install rspec


See [here] for details of our Ruby training. Public courses will overview design, testing, test driven development and behaviour driven development, and delegates are welcome to learn within such an environment. On private courses, we can take a somewhat more active approach to BDD and TDD and introduce it early on as a framework for much of the course if required.
(written 2015-01-04, updated 2015-01-06)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
R221 - Ruby - Introduction to Cucumber
  [4552] Scenario outlines - tables of values to test - in Gherkin / Cucumber - (2015-10-23)
  [4551] Testing your new class - first steps with cucumber - (2015-10-23)
  [4386] Guide exercise to help you learn Gherkin, Cucumber and Rspec - (2015-01-06)
  [4383] Improved test in Cucumber with RSpec - (2015-01-03)
  [4382] Second step Cucumber and Gherkin - beyond Hello World - (2015-01-03)
  [4381] Installing Cucumber (Ruby) - (2015-01-03)
  [4380] Behaviour Driven Development / Ruby and Cucumber - (2015-01-02)


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