debugger-linecache のbundle に失敗したら

以下のように debugger-linecache のbundle時に失敗したときの対応メモ。

Installing debugger-linecache (1.1.2) with native extensions 

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

        /Users/interu/.rbenv/versions/1.9.3-p362/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-p362 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=/Users/interu/.rbenv/versions/1.9.3-p362/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 /Users/interu/.rbenv/versions/1.9.3-p362/lib/ruby/gems/1.9.1/gems/debugger-linecache-1.1.2 for inspection.

Results logged to /Users/interu/.rbenv/versions/1.9.3-p362/lib/ruby/gems/1.9.1/gems/debugger-linecache-1.1.2/ext/trace_nums/gem_make.out

An error occurred 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.

こんなエラーが出たら、debugger-ruby_core_source をインストールしておくと解決します。

$ gem install debugger-ruby_core_source -v1.1.6