therubyracerのインストールでエラー

libv8がどうのとか言ってる。
http://www.ruby-forum.com/topic/4306127

libv8をアンインストールしてtherubyracerを入れたら上手く言った。

Installing therubyracer (0.10.1) with native extensions 
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

        /home/shohei/.rbenv/versions/1.9.3-p125/bin/ruby extconf.rb 
*** 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/shohei/.rbenv/versions/1.9.3-p125/bin/ruby
extconf.rb:15:in `<main>': undefined method `include_path' for Libv8:Module (NoMethodError)


Gem files will remain installed in /home/shohei/.rbenv/versions/1.9.3-p125/lib/ruby/gems/1.9.1/gems/therubyracer-0.10.1 for inspection.
Results logged to /home/shohei/.rbenv/versions/1.9.3-p125/lib/ruby/gems/1.9.1/gems/therubyracer-0.10.1/ext/v8/gem_make.out
An error occurred while installing therubyracer (0.10.1), and Bundler cannot continue.
Make sure that `gem install therubyracer -v '0.10.1'` succeeds before bundling.
[shohei@www11136ui mongoapi]$ gem install therubyracer -v '0.10.1'
Building native extensions.  This could take a while...
ERROR:  Error installing therubyracer:
	ERROR: Failed to build gem native extension.

        /home/shohei/.rbenv/versions/1.9.3-p125/bin/ruby extconf.rb
*** 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/shohei/.rbenv/versions/1.9.3-p125/bin/ruby
extconf.rb:15:in `<main>': undefined method `include_path' for Libv8:Module (NoMethodError)


Gem files will remain installed in /home/shohei/.rbenv/versions/1.9.3-p125/lib/ruby/gems/1.9.1/gems/therubyracer-0.10.1 for inspection.
Results logged to /home/shohei/.rbenv/versions/1.9.3-p125/lib/ruby/gems/1.9.1/gems/therubyracer-0.10.1/ext/v8/gem_make.out
[shohei@www11136ui mongoapi]$ 
[shohei@www11136ui mongoapi]$ 
[shohei@www11136ui mongoapi]$ gem uninstall libv8

Select gem to uninstall:
 1. libv8-3.3.10.4-x86_64-linux
 2. libv8-3.11.8.13-x86_64-linux
 3. All versions
> 3
Successfully uninstalled libv8-3.3.10.4-x86_64-linux

You have requested to uninstall the gem:
	libv8-3.11.8.13-x86_64-linux
therubyracer-0.11.3 depends on [libv8 (~> 3.11.8.12)]
If you remove this gems, one or more dependencies will not be met.
Continue with Uninstall? [Yn]  Y
Successfully uninstalled libv8-3.11.8.13-x86_64-linux
[shohei@www11136ui mongoapi]$ gem install therubyracer -v '0.10.1'
Fetching: libv8-3.3.10.4-x86_64-linux.gem (100%)
Building native extensions.  This could take a while...
Successfully installed libv8-3.3.10.4-x86_64-linux
Successfully installed therubyracer-0.10.1
2 gems installed
Installing ri documentation for libv8-3.3.10.4-x86_64-linux...
Installing ri documentation for therubyracer-0.10.1...
Installing RDoc documentation for libv8-3.3.10.4-x86_64-linux...
Installing RDoc documentation for therubyracer-0.10.1...