Came across this error when I tried to install jekyll on my ubuntu laptop for testing out jekyll bootstrap locally:
sudo gem install jekyll Building native extensions. This could take a while... ERROR: Error installing jekyll: 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/fast-stemmer-1.0.2 for inspection. Results logged to /var/lib/gems/1.9.1/gems/fast-stemmer-1.0.2/ext/gem_make.out
Apparently this is due to a missing
ruby-dev-package according to this issue: https://github.com/jekyll/jekyll-help/issues/209.
And this is how you fix it:
$ sudo apt-get install ruby-dev