问题
When trying to run jekyll serve, it seems to build correctly (though with warnings that I haven't been able to resolve), but then fails to serve. jekyll build completes, but the resulting files are missing the compiled CSS.
Output from jekyll serve:
Ignoring ffi-1.9.10 because its extensions are not built. Try: gem pristine ffi --version 1.9.10
Ignoring curb-0.9.3 because its extensions are not built. Try: gem pristine curb --version 0.9.3
Ignoring executable-hooks-1.3.2 because its extensions are not built. Try: gem pristine executable-hooks --version 1.3.2
Ignoring ffi-1.9.10 because its extensions are not built. Try: gem pristine ffi --version 1.9.10
Ignoring gem-wrappers-1.2.7 because its extensions are not built. Try: gem pristine gem-wrappers --version 1.2.7
Ignoring json-1.8.2 because its extensions are not built. Try: gem pristine json --version 1.8.2
Ignoring thin-1.6.1 because its extensions are not built. Try: gem pristine thin --version 1.6.1
Configuration file: /home/jtebert/OwnCloud/Projects/Programming/python/AMS/mockup/_config.yml
Source: /home/jtebert/OwnCloud/Projects/Programming/python/AMS/mockup
Destination: /home/jtebert/OwnCloud/Projects/Programming/python/AMS/mockup/_site
Incremental build: disabled. Enable with --incremental
Generating...
done in 1.404 seconds.
/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:120:in `require': incompatible library version - /home/jtebert/.rvm/gems/ruby-2.0.0-p643/gems/ffi-1.9.10/lib/ffi_c.so (LoadError)
from /usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:120:in `require'
from /home/jtebert/.rvm/gems/ruby-2.0.0-p643/gems/ffi-1.9.10/lib/ffi.rb:6:in `rescue in <top (required)>'
from /home/jtebert/.rvm/gems/ruby-2.0.0-p643/gems/ffi-1.9.10/lib/ffi.rb:3:in `<top (required)>'
from /usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:120:in `require'
from /usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:120:in `require'
from /home/jtebert/.rvm/gems/ruby-2.0.0-p643/gems/rb-inotify-0.9.7/lib/rb-inotify/native.rb:1:in `<top (required)>'
from /usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:68:in `require'
from /usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:68:in `require'
from /home/jtebert/.rvm/gems/ruby-2.0.0-p643/gems/rb-inotify-0.9.7/lib/rb-inotify.rb:1:in `<top (required)>'
from /usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:68:in `require'
from /usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:68:in `require'
from /home/jtebert/.rvm/gems/ruby-2.0.0-p643/gems/listen-3.0.6/lib/listen/adapter/linux.rb:30:in `_configure'
from /home/jtebert/.rvm/gems/ruby-2.0.0-p643/gems/listen-3.0.6/lib/listen/adapter/base.rb:45:in `block in configure'
from /home/jtebert/.rvm/gems/ruby-2.0.0-p643/gems/listen-3.0.6/lib/listen/adapter/base.rb:40:in `each'
from /home/jtebert/.rvm/gems/ruby-2.0.0-p643/gems/listen-3.0.6/lib/listen/adapter/base.rb:40:in `configure'
from /home/jtebert/.rvm/gems/ruby-2.0.0-p643/gems/listen-3.0.6/lib/listen/adapter/base.rb:63:in `start'
from /home/jtebert/.rvm/gems/ruby-2.0.0-p643/gems/listen-3.0.6/lib/listen/backend.rb:26:in `start'
from /home/jtebert/.rvm/gems/ruby-2.0.0-p643/gems/listen-3.0.6/lib/listen/listener.rb:67:in `block in <class:Listener>'
from /home/jtebert/.rvm/gems/ruby-2.0.0-p643/gems/listen-3.0.6/lib/listen/fsm.rb:120:in `instance_eval'
from /home/jtebert/.rvm/gems/ruby-2.0.0-p643/gems/listen-3.0.6/lib/listen/fsm.rb:120:in `call'
from /home/jtebert/.rvm/gems/ruby-2.0.0-p643/gems/listen-3.0.6/lib/listen/fsm.rb:91:in `transition_with_callbacks!'
from /home/jtebert/.rvm/gems/ruby-2.0.0-p643/gems/listen-3.0.6/lib/listen/fsm.rb:57:in `transition'
from /home/jtebert/.rvm/gems/ruby-2.0.0-p643/gems/listen-3.0.6/lib/listen/listener.rb:90:in `start'
from /home/jtebert/.rvm/gems/ruby-2.0.0-p643/gems/jekyll-watch-1.3.1/lib/jekyll/watcher.rb:12:in `watch'
from /home/jtebert/.rvm/gems/ruby-2.0.0-p643/gems/jekyll-3.1.3/lib/jekyll/commands/build.rb:72:in `watch'
from /home/jtebert/.rvm/gems/ruby-2.0.0-p643/gems/jekyll-3.1.3/lib/jekyll/commands/build.rb:39:in `process'
from /home/jtebert/.rvm/gems/ruby-2.0.0-p643/gems/jekyll-3.1.3/lib/jekyll/commands/serve.rb:34:in `block (2 levels) in init_with_program'
from /home/jtebert/.rvm/gems/ruby-2.0.0-p643/gems/mercenary-0.3.5/lib/mercenary/command.rb:220:in `block in execute'
from /home/jtebert/.rvm/gems/ruby-2.0.0-p643/gems/mercenary-0.3.5/lib/mercenary/command.rb:220:in `each'
from /home/jtebert/.rvm/gems/ruby-2.0.0-p643/gems/mercenary-0.3.5/lib/mercenary/command.rb:220:in `execute'
from /home/jtebert/.rvm/gems/ruby-2.0.0-p643/gems/mercenary-0.3.5/lib/mercenary/program.rb:42:in `go'
from /home/jtebert/.rvm/gems/ruby-2.0.0-p643/gems/mercenary-0.3.5/lib/mercenary.rb:19:in `program'
from /home/jtebert/.rvm/gems/ruby-2.0.0-p643/gems/jekyll-3.1.3/bin/jekyll:13:in `<top (required)>'
from /usr/local/bin/jekyll:23:in `load'
from /usr/local/bin/jekyll:23:in `<main>'
When trying to start a Jekyll project, I did have to create a link of Ruby versions because it was looking for 'Ruby2.1', but I'm not sure if this is playing a role in the current problem: ln -s /usr/bin/ruby '/usr/bin/ruby2.1'.
According to my package manager, I've installed Ruby 2.3.0. But according to which ruby, I'm using 2.0.0 which it's getting from rvm: /home/xxxxxxx/.rvm/rubies/ruby-2.0.0-p643/bin/ruby. And as I mentioned before, Jekyll seems to want v2.1 for something. I'm guessing these conflicting versions are somehow causing the problem, but I don't know how to resolve it.
回答1:
In my case I had to install the ffi library with gem:
gem install ffi
This error is probably caused by an older version of the library installed in the system. gem then installs the correct version for your project.
回答2:
The problem for me seemed to be rvm (which I'm not sure how I ended up using). The solution was to remove rvm with rvm implode, then reinstall jekyll with gem install jekyll. Both the warnings and errors disappeared, and it is serving properly.
来源：https://stackoverflow.com/questions/36828951/jekyll-fails-to-serve-ruby-incompatible-library-version