Mac OS 10.10.2 + Ruby on Rails

gistfile1.txt

ruby 2.1.5p273 + Rails 4.2.0 + Homebrew 0.9.5

If you follow the guide from https://gorails.com/setup/osx/10.10-yosemite or similar 
and get the nokogiri error like: 

$ rails new myapp
checking for xmlParseDoc() in libxml/parser.h... no
checking for xmlParseDoc() in -lxml2... no
checking for xmlParseDoc() in -llibxml2... no
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libxml2 is missing.  Please locate mkmf.log to investigate how it is failing.
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You should you this trick: 
$ brew tap homebrew/dupes
$ brew install libxml2 libxslt libiconv
$ brew link --force libxml2 libxslt libiconv

$ bundle config build.nokogiri --use-system-libraries --with-iconv-dir="$(brew --prefix libiconv)"
$ bundle install --path vendor/bundle

and try again: 
$ rails new myapp