Ao executar o Jekyll estava recebendo o seguinte erro:
/Users/glauco/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require': iconv will be deprecated in the future, use String#encode instead.
Configuration from /Users/glauco/Github/glauco.github.com/_config.yml
Building site: . -> ./_site
/Users/glauco/.rvm/gems/ruby-1.9.3-p194/gems/jekyll-0.11.2/lib/jekyll/convertible.rb:29:in `read_yaml': invalid byte sequence in US-ASCII (ArgumentError)
from /Users/glauco/.rvm/gems/ruby-1.9.3-p194/gems/jekyll-0.11.2/lib/jekyll/layout.rb:31:in `initialize'
from /Users/glauco/.rvm/gems/ruby-1.9.3-p194/gems/jekyll-0.11.2/lib/jekyll/site.rb:113:in `new'
from /Users/glauco/.rvm/gems/ruby-1.9.3-p194/gems/jekyll-0.11.2/lib/jekyll/site.rb:113:in `block in read_layouts'