gistfile1.txt

Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension. 
/home/travis/.rvm/rubies/ruby-1.9.3-p327/bin/ruby extconf.rb 
checking for vm_core.h... no 
checking for vm_core.h... no 
Makefile creation failed 
************************************************************************** 
No source for ruby-1.9.3-p327 provided with debugger-ruby_core_source gem. 
************************************************************************** 
*** extconf.rb failed *** 
Could not create Makefile due to some reason, probably lack of 
necessary libraries and/or headers. Check the mkmf.log file for more 
details. You may need configuration options. 
 
Provided configuration options: 
	--with-opt-dir 
	--without-opt-dir 
	--with-opt-include 
	--without-opt-include=${opt-dir}/include 
	--with-opt-lib 
	--without-opt-lib=${opt-dir}/lib 
	--with-make-prog 
	--without-make-prog 
	--srcdir=. 
	--curdir 
	--ruby=/home/travis/.rvm/rubies/ruby-1.9.3-p327/bin/ruby 
	--with-ruby-dir 
	--without-ruby-dir 
	--with-ruby-include 
	--without-ruby-include=${ruby-dir}/include 
	--with-ruby-lib 
	--without-ruby-lib=${ruby-dir}/lib 
 
 
Gem files will remain installed in /home/travis/.rvm/gems/ruby-1.9.3-p327/gems/debugger-linecache-1.1.2 for inspection. 
Results logged to /home/travis/.rvm/gems/ruby-1.9.3-p327/gems/debugger-linecache-1.1.2/ext/trace_nums/gem_make.out 
An error occured while installing debugger-linecache (1.1.2), and Bundler cannot continue. 
Make sure that `gem install debugger-linecache -v '1.1.2'` succeeds before bundling.

I ran into this too. It looks like the debugger dependency is incompatible with patchlevel 327 for now, but Travis recommends excluding debugger for CI anyways.

I mailed the google group about this, but I came up with a solution. This is how I figured out how to make debugger installed for local development and not for CI.

---

Minimal code example follows:

---------- Gemfile ----------

group :debugging do
gem 'debugger'
end

---------- .travis.yml ----------

bundler_args: --without debugging

---------- config/application.rb ----------

if defined?(Bundler)

Don't load the debug bundler group for Travis CI

debug_group = ENV['TRAVIS'] ? %w{development} : %w{development test}

bundle_groups = {
:assets => %w{development test},
:debugging => debug_group
}

If you precompile assets before deploying to production, use this line

Bundler.require *Rails.groups(bundle_groups)
end

This worked for me as well as a bunch of other people from this gist: https://gist.github.com/4060260

gem install debugger-linecache -v '1.1.2' -- --with-ruby-include=$rvm_path/src/ruby-1.9.3-p327/