Can't install Nokogiri gem, "libxml/parser.h" not found, but its there, why?

This will work.

sudo apt-get install libxslt-dev libxml2-devgem install nokogiri

ruby gem nokogiri libxml2

I just faced the same issue on (cat /etc/centos-release:) CentOS release 6.6 (Final).

sudo yum install -y rubygem-nokogiri

…fixed that problem.

CodeHunter