Error - "gem install rails" - libxml2 is missing

I just had the same problem and was able to solve it as follows:

Installing Nokogiri separately worked only when using the system libraries:

gem install nokogiri -- --use-system-libraries

...but was still failing when executing bundle install. So just configure bundler to also build Nokogiri using the system libraries:

bundle config build.nokogiri --use-system-libraries

ruby-on-rails ruby nokogiri libxml2

You don't have the required library, and it is so easy to google solution:

 brew install libxml2

ruby-on-rails ruby nokogiri libxml2

Try using this:

sudo gem install rails -- --use-system-libraries --with-xml=/usr/local/Cellar/libxml2/

CodeHunter