Installing gems on JRuby

[davidhq]

I'm trying to deploy an app on JRuby with Mina, but one gem doesn't install and actually it shouldn't be installed in the first place...

The gem is unf_ext and it is a Mechanize dependency. If I SSH to the server and try to install Mechanize, it installs without problems and only unf installs as a result, not unf_ext.

Error:

Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension. 

       /home/linkrecover/.rbenv/versions/jruby-1.7.13/bin/jruby extconf.rb  
   NotImplementedError: C extension support is not enabled. Pass -Xcext.enabled=true to JRuby or set JRUBY_OPTS. 

      (root) at /home/linkrecover/.rbenv/versions/jruby-1.7.13/lib/ruby/shared/mkmf.rb:8 
     require at org/jruby/RubyKernel.java:1065 
      (root) at /home/linkrecover/.rbenv/versions/jruby-1.7.13/lib/ruby/shared/rubygems/core_ext/kernel_require.rb:1 
      (root) at extconf.rb:1 


   Gem files will remain installed in /var/www/lr/tmp/build-14062262733806/vendor/bundle/jruby/1.9/gems/unf_ext-0.0.6 for inspection. 
   Results logged to /var/www/lr/tmp/build-14062262733806/vendor/bundle/jruby/1.9/gems/unf_ext-0.0.6/ext/unf_ext/gem_make.out 
   An error occurred while installing unf_ext (0.0.6), and Bundler cannot continue. 
   Make sure that `gem install unf_ext -v '0.0.6'` succeeds before bundling. 

My Gemfile: https://gist.github.com/davidhq/09d84bc79683b9d3332e

So how to make bundler install everything nicely when run through Mina? It's possible that this is a bundler issue... How could I test it? E.g. try to install gems for the app in question manually to where mina is trying to install them - shared/bundle/jruby/1.9/gems?

[d4be4st]

probably your env variables are not set up properly.

related issue: #311