How to install Nokogiri Ruby gem with mkmf.log saying libiconv not found?

Question

I\'m installing the Ruby Nokogiri gem and finding the error below.

How to diagnose this and solve it?

# gem install nokogiri
Building native extensio         


        

Answer 1

On CentOS here is what I needed to do:

gem update --system
yum install libxml2-devel libxslt-devel ruby-devel
gem install nokogiri -- --use-system-libraries