How to fix Nokogiri on Ubuntu?

Question

I run Ubuntu 13.04 on my workstation with ruby 2.0.0, which was installed via RVM.

$ aptitude show libxml2

Package: libxml2 State: installed Automatically instlled: no Multi-Arch: same Version: 2.9.0+dfsg1-4ubuntu4.1

$ aptitude show libxml2-dev

Package: libxml2-dev State: installed Automatically installed: no Multi-Arch: same Version: 2.9.0+dfsg1-4ubuntu4.1

$ aptitude show libxslt-dev

Package: libxslt1-dev State: installed Automatically installed: no Version: 1.1.27-1ubuntu2 Priority: optional

$ nokogiri -v

WARNING: Nokogiri was built against LibXML version 2.9.0, but has dynamically loaded 2.8.0 # Nokogiri (1.6.0) --- warnings: - Nokogiri was built against LibXML version 2.9.0, but has dynamically loaded 2.8.0 nokogiri: 1.6.0 ruby: version: 2.0.0 platform: x86_64-linux description: ruby 2.0.0p195 (2013-05-14 revision 40734) [x86_64-linux] engine: ruby libxml: binding: extension source: packaged libxml2_path: /home/pb/.rvm/gems/ruby-2.0.0-p195/gems/nokogiri-1.6.0/ports/x86_64-linux-gnu/libxml2/2.8.0 libxslt_path: /home/pb/.rvm/gems/ruby-2.0.0-p195/gems/nokogiri-1.6.0/ports/x86_64-linux-gnu/libxslt/1.1.26 compiled: 2.9.0 loaded: 2.8.0

I installed nokogiri with the command, because else it's using libxml2 version 2.8.0, but I'm not sure where it takes this from, since just libxml2 is installed via apt.

gem install nokogiri -- --with-xml2-include=/usr/include/libxml2/libxml --with-xslt-dir=/usr/include/libxslt

When I run my application I get the following error:

/home/pb/.rvm/rubies/ruby-2.0.0-p195/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in require': /home/pb/.rvm/gems/ruby-2.0.0-p195/gems/nokogiri-1.6.0/ports/x86_64-linux-gnu/libxml2/2.8.0/lib/libxml2.so.2: versionLIBXML2_2.9.0' not found (required by /home/pb/.rvm/gems/ruby-2.0.0-p195/gems/libxml-ruby-2.6.0/lib/libxml_ruby.so) - /home/pb/.rvm/gems/ruby-2.0.0-p195/gems/libxml-ruby-2.6.0/lib/libxml_ruby.so (LoadError)

Can anyone tell me how I get rid of libxml2 version 2.8.0?

Thanks

Nowaker Nowaker · Accepted Answer · 2013-11-12T02:14:32

Nokogiri is using its own version of libxml by default. Probably because Mac OS provides a version of libxml that is dated 2001 (!), and old libraries don't provide features Nokogiri depends on. However, this may cause a problem with the systems that are kept up-to-date. To resolve the problem you need to build Nokogiri against the libraries your OS provides.

This maybe something like this, it's from Arch Linux:

gem install nokogiri -- \
  --with-xml2-include=/usr/include/libxml2/libxml \
  --with-xml2-lib=/usr/lib \
  --with-xslt-include=/usr/include/libxslt \
  --with-xslt-lib=/usr/lib

You may need to install development packages if using distros like Ubuntu or Fedora. It should be libxml2-dev and libxslt1-dev on Ubuntu but correct me if I'm wrong.

How to fix Nokogiri on Ubuntu?

4 Answers