:~$ jekyll new myblog
/var/lib/gems/1.9.1/gems/execjs-2.5.2/lib/execjs/runtimes.rb:48:in `autodetect': Could not find a JavaScript runtime. See
https://github.com/rails/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable)
from /var/lib/gems/1.9.1/gems/execjs-2.5.2/lib/execjs.rb:5:in `<module:ExecJS>'
from /var/lib/gems/1.9.1/gems/execjs-2.5.2/lib/execjs.rb:4:in `<top (required)>'
from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
from /var/lib/gems/1.9.1/gems/coffee-script-2.4.1/lib/coffee_script.rb:1:in `<top (required)>'
from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
from /var/lib/gems/1.9.1/gems/coffee-script-2.4.1/lib/coffee-script.rb:1:in `<top (required)>'
from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
from /var/lib/gems/1.9.1/gems/jekyll-coffeescript-1.0.1/lib/jekyll-coffeescript.rb:2:in `<top (required)>'
from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
from /var/lib/gems/1.9.1/gems/jekyll-2.5.3/lib/jekyll/deprecator.rb:46:in `block in gracefully_require'
from /var/lib/gems/1.9.1/gems/jekyll-2.5.3/lib/jekyll/deprecator.rb:44:in `each'
from /var/lib/gems/1.9.1/gems/jekyll-2.5.3/lib/jekyll/deprecator.rb:44:in `gracefully_require'
from /var/lib/gems/1.9.1/gems/jekyll-2.5.3/lib/jekyll.rb:166:in `<top (required)>'
from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
from /var/lib/gems/1.9.1/gems/jekyll-2.5.3/bin/jekyll:6:in `<top (required)>'
from /usr/local/bin/jekyll:23:in `load'
from /usr/local/bin/jekyll:23:in `<main>'