bundle install するとlibv8が...noになる

• MacOS EL Capitan 10.11.6
• Ruby 2.3.3

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

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siteconf20170329-3176-1qijbxq.rb extconf.rb
checking for main() in -lpthread... yes
checking for main() in -lobjc... yes
checking for v8.h... no
*** 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/taku/.rbenv/versions/2.3.3/bin/$(RUBY_BASE_NAME)
    --with-pthreadlib
    --without-pthreadlib
    --with-objclib
    --without-objclib
    --enable-debug
    --disable-debug
    --with-v8-dir
    --without-v8-dir
    --with-v8-include
    --without-v8-include=${v8-dir}/include
    --with-v8-lib
    --without-v8-lib=${v8-dir}/lib
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thanks,
The Mgmt

    from /Users/taku/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/libv8-3.16.14.13/lib/libv8.rb:7:in `configure_makefile'
    from extconf.rb:32:in `<main>'

To see why this extension failed to compile, please check the mkmf.log which can be found here:

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extconf failed, exit code 1

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An error occurred while installing therubyracer (0.12.2), and Bundler cannot continue.
Make sure that `gem install therubyracer -v '0.12.2'` succeeds before bundling.

libv8をインストールします

$ bundle update libv8

えっ通った？

$ bundle install

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Bundle complete! 97 Gemfile dependencies, 200 gems now installed.
Use `bundle show [gemname]` to see where a bundled gem is installed.

でけたーーーーーーーーーーー！
２日もかかった...