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我已经在 git bash 中安装了这个包，它说我必须安装 therubyracer 0.11.4。我已经安装了很多次，但它不能在我的 windows 7 中运行。如何解决这个问题？

$ gem install therubyracer -v '0.11.4'
Temporarily enhancing PATH to include DevKit...
Building native extensions.  This could take a while...
ERROR:  Error installing therubyracer:
        ERROR: Failed to build gem native extension.

        c:/RailsInstaller/Ruby1.9.3/bin/ruby.exe extconf.rb
checking for main() in -lpthread... no
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=c:/RailsInstaller/Ruby1.9.3/bin/ruby
        --with-pthreadlib
        --without-pthreadlib
        --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}/
c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/libv8-3.11.8.17/ext/libv8/l
ocation.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 3.11.8.17 installed. You may
need to special --with-v8-dir options if it is in a non-standard
location

thanks,
The Mgmt

        from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/libv8-3.11.8.1
7/lib/libv8.rb:7:in `configure_makefile'
        from extconf.rb:32:in `<main>'


Gem files will remain installed in c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9
.1/gems/therubyracer-0.11.4 for inspection.
Results logged to c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/therubyra
cer-0.11.4/ext/v8/gem_make.out
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