mastodon@arnet ~/live $ bundle exec gem pristine --all
Restoring gems to pristine condition...
Restored rake-12.3.0
Restored concurrent-ruby-1.0.5
Restored i18n-0.9.1
Restored minitest-5.10.3
Restored thread_safe-0.3.6
Restored tzinfo-1.2.4
Restored activesupport-5.1.4
Restored builder-3.2.3
Restored erubi-1.7.0
Restored mini_portile2-2.3.0
Building native extensions.  This could take a while...
ERROR:  While executing gem ... (Gem::Ext::BuildError)
    ERROR: Failed to build gem native extension.

    current directory: /home/mastodon/live/vendor/bundle/ruby/2.4.0/gems/nokogiri-1.8.1/ext/nokogiri
/home/mastodon/.rbenv/versions/2.4.2/bin/ruby -r ./siteconf20180126-1434-yyohir.rb extconf.rb
/home/mastodon/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/bundler-1.16.1/lib/bundler/spec_set.rb:88:in `block in materialize': Could not find nokogiri-1.8.1 in any of the sources (Bundler::GemNotFound)
        from /home/mastodon/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/bundler-1.16.1/lib/bundler/spec_set.rb:82:in `map!'
        from /home/mastodon/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/bundler-1.16.1/lib/bundler/spec_set.rb:82:in `materialize'
        from /home/mastodon/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/bundler-1.16.1/lib/bundler/definition.rb:170:in `specs'
        from /home/mastodon/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/bundler-1.16.1/lib/bundler/definition.rb:237:in `specs_for'
        from /home/mastodon/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/bundler-1.16.1/lib/bundler/definition.rb:226:in `requested_specs'
        from /home/mastodon/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/bundler-1.16.1/lib/bundler/runtime.rb:108:in `block in definition_method'
        from /home/mastodon/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/bundler-1.16.1/lib/bundler/runtime.rb:20:in `setup'
        from /home/mastodon/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/bundler-1.16.1/lib/bundler.rb:107:in `setup'
        from /home/mastodon/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/bundler-1.16.1/lib/bundler/setup.rb:20:in `<top (required)>'
        from /home/mastodon/.rbenv/versions/2.4.2/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:55:in `require'
        from /home/mastodon/.rbenv/versions/2.4.2/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:55:in `require'

extconf failed, exit code 1

Gem files will remain installed in /home/mastodon/live/vendor/bundle/ruby/2.4.0/gems/nokogiri-1.8.1 for inspection.
Results logged to /home/mastodon/live/vendor/bundle/ruby/2.4.0/extensions/x86_64-linux/2.4.0-static/nokogiri-1.8.1/gem_make.out