When trying to install jekyll, I got the following error:
mkmf.rb can't find header files for ruby at /usr/lib/ruby/include/ruby.h
$ sudo gem install jekyll Fetching: liquid-2.6.2.gem (100%) Successfully installed liquid-2.6.2 Fetching: kramdown-1.6.0.gem (100%) Successfully installed kramdown-1.6.0 Fetching: mercenary-0.3.5.gem (100%) Successfully installed mercenary-0.3.5 Fetching: safe_yaml-1.0.4.gem (100%) Successfully installed safe_yaml-1.0.4 Fetching: colorator-0.1.gem (100%) Successfully installed colorator-0.1 Fetching: posix-spawn-0.3.10.gem (100%) Building native extensions. This could take a while... ERROR: Error installing jekyll: ERROR: Failed to build gem native extension. /usr/bin/ruby2.1 extconf.rb mkmf.rb can't find header files for ruby at /usr/lib/ruby/include/ruby.h
It turns out that I was missing the ruby development packages:
$ sudo apt-get install ruby-dev
Once I’d installed this, Jekyll installed fine.
Michael is a polyglot software engineer, committed to reducing complexity in systems and making them more predictable. Working with a variety of languages and tools, he shares his technical expertise to audiences all around the world at user groups and conferences. You can follow @mheap on Twitter