gistfile1.txt

hawk@erde letters]$ make site
docker run \
	--rm \
	-v /home/hawk/projects/letters/tmp:/data \
	-t ahawkins/letters \
	bundle exec jekyll build --destination /data
/usr/local/lib/ruby/gems/2.1.0/gems/execjs-2.2.0/lib/execjs/runtimes.rb:51:in `autodetect': Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable)
	from /usr/local/lib/ruby/gems/2.1.0/gems/execjs-2.2.0/lib/execjs.rb:5:in `<module:ExecJS>'
	from /usr/local/lib/ruby/gems/2.1.0/gems/execjs-2.2.0/lib/execjs.rb:4:in `<top (required)>'
	from /usr/local/lib/ruby/gems/2.1.0/gems/coffee-script-2.2.0/lib/coffee_script.rb:1:in `require'
	from /usr/local/lib/ruby/gems/2.1.0/gems/coffee-script-2.2.0/lib/coffee_script.rb:1:in `<top (required)>'
	from /usr/local/lib/ruby/gems/2.1.0/gems/coffee-script-2.2.0/lib/coffee-script.rb:1:in `require'
	from /usr/local/lib/ruby/gems/2.1.0/gems/coffee-script-2.2.0/lib/coffee-script.rb:1:in `<top (required)>'
	from /usr/local/lib/ruby/gems/2.1.0/gems/jekyll-coffeescript-1.0.0/lib/jekyll-coffeescript.rb:2:in `require'
	from /usr/local/lib/ruby/gems/2.1.0/gems/jekyll-coffeescript-1.0.0/lib/jekyll-coffeescript.rb:2:in `<top (required)>'
	from /usr/local/lib/ruby/gems/2.1.0/gems/jekyll-2.0.3/lib/jekyll.rb:73:in `require'
	from /usr/local/lib/ruby/gems/2.1.0/gems/jekyll-2.0.3/lib/jekyll.rb:73:in `<top (required)>'
	from /usr/local/lib/ruby/gems/2.1.0/gems/jekyll-2.0.3/bin/jekyll:6:in `require'
	from /usr/local/lib/ruby/gems/2.1.0/gems/jekyll-2.0.3/bin/jekyll:6:in `<top (required)>'
	from /usr/local/bin/jekyll:23:in `load'
	from /usr/local/bin/jekyll:23:in `<main>'
Makefile:8: recipe for target 'site' failed
make: *** [site] Error 1