I needed to clearly indicate its location, as well as the icon. That was a few weeks ago, but I seem to remember that it was like this:
gem install nokogiri
This is for me (OSX 10.9):
gem install nokogiri -- --with-xml2-lib=/opt/local/lib --with-xml2-include=/opt/local/include/libxml2 --with-iconv-dir=/usr/local
source
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