Mike has worked hard over the years to have Nokogiri come with its dependencies. It does come with libxml and all that is required. From https://nokogiri.org h

Mike has worked hard over the years to have Nokogiri come with its dependencies. It does come with libxml and all that is required. From https://nokogiri.org https://nokogiri.org > These dependencies are met by default by Nokogiri's packaged versions of the libxml2 and libxslt source code, but a configuration option --use-system-libraries is provided to allow specification of alternative library locations. Some authors work hard to have their tools do the right thing and consistently.