Jekyll Installation Instructions

[abostroem]

I just tried to follow the Jekyll installation instructions running on Mac OS 10.12.6 (Sierra). The default version of Ruby (2.0) is not supported by Jekyll and doing gem update ruby didn't get me a more recent version. I had to do the following:

#Install Homebrew if you haven't
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

#Install rbenv
brew update
brew install rbenv ruby-build
rbenv init
rbenv install 2.4.1
rbenv global 2.4.1

export PATH="$HOME/.rbenv/bin:$PATH"
eval "$(rbenv init -)"

rbenv rehash

Then I could run Jekyll. It might be nice to include this information for future instructors.

[rgaiacs]

@abostroem Thanks very much for the report. I will try add it to the README.md when I'm back from holidays.

[r4space]

For linux systems too, text about installing ruby-dev would also be helful

[fmichonneau]

we're updating the installation instructions in carpentries/lesson-example#276 closing here.