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For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
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
  [4380] Behaviour Driven Development / Ruby and Cucumber - (2015-01-02)
  [4381] Installing Cucumber (Ruby) - (2015-01-03)
  [4382] Second step Cucumber and Gherkin - beyond Hello World - (2015-01-03)
  [4383] Improved test in Cucumber with RSpec - (2015-01-03)
  [4386] Guide exercise to help you learn Gherkin, Cucumber and Rspec - (2015-01-06)
  [4551] Testing your new class - first steps with cucumber - (2015-10-23)
  [4552] Scenario outlines - tables of values to test - in Gherkin / Cucumber - (2015-10-23)


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Installing Cucumber on Ubuntu - cannot load such file -- mkmf (LoadError) message
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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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