on Linux, how can I resolve WARNING: Nokogiri was built against LibXML version 2.8.0, but has dynamically loaded 2.9.0 ?

Question

Mac users, see: Mac user and getting WARNING: Nokogiri was built against LibXML version 2.7.8, but has dynamically loaded 2.7.3

I'm using linux (openSUSE 12.3) and running nokogiri -v shows:

WARNING: Nokogiri was built against LibXML version 2.8.0, but  dynamically loaded 2.9.0
# Nokogiri (1.6.0)
---
warnings:
- Nokogiri was built against LibXML version 2.8.0, but  dynamically loaded 2.9.0
nokogiri: 1.6.0
ruby:
  version: 2.0.0
  platform: x86_64-linux
  description: ruby 2.0.0p247 (2013-06-27 revision 41674) [x86_64-linux]
  engine: ruby
libxml:
  binding: extension
  source: packaged
  libxml2_path: /home/william/.rvm/gems/ruby-2.0.0-p247/gems/nokogiri-1.6.0/ports/x86_64-suse-linux/libxml2/2.8.0
  libxslt_path: /home/william/.rvm/gems/ruby-2.0.0-p247/gems/nokogiri-1.6.0/ports/x86_64-suse-linux/libxslt/1.1.26
  compiled: 2.8.0
  loaded: 2.9.0

Answer 1

The implicit question here seems to be "why am I getting this warning, and what can I do about it?"

You are getting the warning because Nokogiri was built (it is a largely native-extension gem, requiring compilation) against LibXML version 2.8.0, and your system has since upgraded LibXML to version 2.9.0.

This is a warning, not at error -- in many cases, Nokogiri will continue to work fine with a newer version of LibXML than it was built against.

If you run into problems or just want to be on the safe side, rebuilding Nokogiri will solve the issue -- it will be built against the version of LibXML currently installed.