kgio, raindrops, unicorn and Ruby 2.2.0-preview1

I was trying to upgrade Codetriage to use Ruby 2.2.0-preview, the latest Ruby version. The project is hosted on Heroku. So to upgrade I changed Ruby version in Gemfile:

# Gemfile
ruby '2.2.0'

After that I tried to do bundle install:

bundle install

And boom. Got error:

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    /Users/prathamesh/.rbenv/versions/2.2.0-preview1/bin/ruby -r ./siteconf20141002-23644-1wbcnhc.rb extconf.rb
creating Makefile

make "DESTDIR=" clean

make "DESTDIR="
compiling accept.c
In file included from accept.c:90:
/Users/prathamesh/.rbenv/versions/2.2.0-preview1/include/ruby-2.2.0/ruby/backward/rubysig.h:14:2: warning: rubysig.h is obsolete [-W#warnings]
#warning rubysig.h is obsolete
accept.c:101:2: error: use of undeclared identifier 'TRAP_BEG'
accept.c:103:2: error: use of undeclared identifier 'TRAP_END'
1 warning and 2 errors generated.
make: *** [accept.o] Error 1

make failed, exit code 2

Gem files will remain installed in /Users/prathamesh/.rbenv/versions/2.2.0-preview1/lib/ruby/gems/2.2.0/gems/kgio-2.8.0 for inspection.
Results logged to /Users/prathamesh/.rbenv/versions/2.2.0-preview1/lib/ruby/gems/2.2.0/extensions/x86_64-darwin-13/2.2.0-static/kgio-2.8.0/gem_make.out
An error occurred while installing kgio (2.8.0), and Bundler cannot continue.
Make sure that `gem install kgio -v '2.8.0'` succeeds before bundling.

kgio gem is dependency of unicorn which is the application server used by Codetriage. Looking at documentation of kgio, I found out that latest gem version is 2.9.2 while as our Gemfile.lock still had 2.8.0.

The exact changelog entry is:

commit 6243d74cc8296d40a66969594e42963c896968ee
Author: Eric Wong <>
Date:   Sat Feb 15 09:21:07 2014 +0000

    kgio 2.9.2 - avoid deprecated/removed function

    This release is for compatibility with future releases of mainline ruby,
    as rb_thread_blocking_region is removed in r44955 of ruby trunk
    This also avoids deprecation warnings fo rb_thread_blocking_region
    2.0 and 2.1.

So looks like this is the version that should be used with new versions of Ruby.


Replaced 2.8.0 with 2.9.2 for kgio gem in Gemfile.lock:

# Gemfile.lock
      multi_json (>= 1.5)
    kgio (2.9.2)
    kramdown (1.3.2)

After updating Gemfile.lock and running bundle install again, it completed successfully. I was able to run the app using Unicorn on Ruby 2.2.0-preview1.

See this PR to see more details.

Happy Hacking!


After i submitted the PR, the tests could not be run on Travis because of error related to installing raindrops gem which is also dependency of Unicorn:

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
    /home/travis/.rvm/rubies/ruby-2.2.0-preview1/bin/ruby -r ./siteconf20141002-1677-1g08hg8.rb extconf.rb
linux_inet_diag.c:28:2: error: ‘TRAP_BEG’ undeclared (first use in this function)
linux_inet_diag.c:28:2: note: each undeclared identifier is reported only once for each function it appears in
linux_inet_diag.c:30:2: error: ‘TRAP_END’ undeclared (first use in this function)
linux_inet_diag.c: At top level:
linux_inet_diag.c:22:1: warning: ‘rb_thread_blocking_region’ defined but not used [-Wunused-function]
make: *** [linux_inet_diag.o] Error 1

I did not had this problem locally when I did bundle install. But to fix this, I again checked documentation for raindrops. Turns out that the latest release of raindrops is 0.13.0 whereas Gemfile.lock was still pointing to 0.11.0. Also this release is specific to 2.2.0 according to changelog.

commit d24900b305a02cdedc4a532253798117f9686b5c
Author: Eric Wong <>
Date:   Tue Feb 18 20:57:46 2014 +0000

    raindrops 0.13.0  several minor fixes and improvements

    Most notably, this release is necessary for Ruby 2.2 (dev).
    Thanks to Koichi Sasada for the bug report!

    Eric Wong (5):
          Rakefile: remove raa_update task
          last_data_recv: do not assume Unicorn includes all constants
          raindrops.gemspec: add wrongdoc dev dependency
          linux_inet_diag: fix Ruby 2.2 (dev) build
          license: use LGPLv2.1 or later (was LGPL (2.1|3.0)-only)

    Hleb Valoshka (1):
          Remove Scope IDs from IPv6 addresses.

Again applied same fix by changing Gemfile.lock and now raindrops is installed on Travis.