therubyracer・nokogiri・libv8の3大つまづくgem

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
（略）
Running 'install' for libxml2 2.9.2... ERROR, 
（略）
*** 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=/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby
  --help
  --clean
  --use-system-libraries
  --enable-static
  --disable-static
  --with-zlib-dir
  --without-zlib-dir
  --with-zlib-include
  --without-zlib-include=${zlib-dir}/include
  --with-zlib-lib
  --without-zlib-lib=${zlib-dir}/lib
  --enable-cross-build
  --disable-cross-build
/Users/hoge/hoge_project/vendor/bundle/ruby/2.0.0/gems/mini_portile2-2.0.0/lib/mini_portile2/mini_portile.rb:366:in `block in execute': Failed to complete install task (RuntimeError)
(略)
extconf failed, exit code 1

Gem files will remain installed in /Users/hoge/hoge_project/vendor/bundle/ruby/2.0.0/gems/nokogiri-1.6.7.2 for inspection.
Results logged to /Users/hoge/hoge_project/vendor/bundle/ruby/2.0.0/extensions/universal-darwin-13/2.0.0/nokogiri-1.6.7.2/gem_make.out
An error occurred while installing nokogiri (1.6.7.2), and Bundler cannot continue.
Make sure that `gem install nokogiri -v '1.6.7.2'` succeeds before bundling.

% brew info libxml2
libxml2: stable 2.9.4 (bottled), HEAD [keg-only]
（以下略）

% bundle config build.nokogiri --use-system-libraries --with-xml2-include=/usr/include/libxml2 --with-xml2-lib=/usr/lib/

/vendor/bundle/gems/libv8-3.16.14.13/ext/libv8/location.rb:50:in `configure': You have
chosen to use the version of V8 found on your system (Libv8::Location::System::NotFoundError)
and *not* the one that is bundle with the libv8 rubygem. However,
it could not be located. please make sure you have a version of
v8 that is compatible with 3.16.14.13 installed. You may
need to special --with-v8-dir options if it is in a non-standard
location

thanks,
The Mgmt

% ruby -rubygems -e 'puts Gem::Platform.new(RUBY_PLATFORM)'

% gem list -rd '^therubyracer$'

*** REMOTE GEMS ***

therubyracer (0.12.3, 0.5.2, 0.5.1, 0.5.0)
    Platforms:
        0.5.0: x86-linux, x86_64-linux
        0.5.1: x86-darwin-9
        0.5.2: x86-darwin-10
        0.12.3: ruby
    Author: Charles Lowell
    Homepage: http://github.com/cowboyd/therubyracer

    Embed the V8 JavaScript interpreter into Ruby

% gem list -rd '^libv8$'

*** REMOTE GEMS ***

libv8 (5.3.332.38.3, 5.3.332.38.1, 3.16.14.17, 3.16.14.15, 3.16.14.7, 3.16.14.5, 3.16.14.3, 3.16.14.1, 3.11.8.13, 3.11.8.3, 3.3.10.4)
    Platforms:
        3.3.10.4: amd64-freebsd-8, x86-darwin-10, x86-darwin-11
        3.11.8.3: x86-freebsd-9
        3.11.8.13: x86_64-darwin-11
        3.16.14.1: x86_64-darwin-10
        3.16.14.3: amd64-freebsd-9, x86_64-darwin-12, x86_64-solaris-2.11
        3.16.14.5: armv6l-linux
        3.16.14.7: x86_64-darwin-13
        3.16.14.15: universal.x86_64-darwin-13, universal.x86_64-darwin-14
        3.16.14.17: universal.x86_64-darwin-15, universal.x86_64-darwin-16
        5.3.332.38.1: x86_64-darwin-14
        5.3.332.38.3: amd64-freebsd-10, amd64-freebsd-11, arm-linux, ruby,
                      universal-darwin-14, universal-darwin-15, universal-darwin-16,
                      x86-linux, x86_64-darwin-15, x86_64-darwin-16, x86_64-linux
    Author: Charles Lowell
    Homepage: http://github.com/cowboyd/libv8

    Distribution of the V8 JavaScript engine

% brew install v8
% bundle config --local build.libv8 --with-system-v8
% bundle config --local build.therubyracer --with-v8-dir=$(brew --prefix v8)