无法在JRuby中安装therubyracer

Mr_*_*Mac 4 ruby linux jruby rvm

我已经安装了RVM,然后安装了Jruby,这是我输入的版本:jruby -v:

jruby 1.6.5.1(ruby-1.8.7-p330)(2011-12-27 1bf37c2)(Java HotSpot(TM)Client VM 1.7.0_02)[linux-i386-java]

问题是我无法安装therubyracer gem,当我尝试通过jruby -S gem install therubyracer安装时,我得到了这个:

/usr/local/rvm/rubies/jruby-1.6.5.1/bin/jruby extconf.rb
WARNING: JRuby does not support native extensions or the `mkmf' library very we$
Check http://kenai.com/projects/jruby/pages/Home for alternatives.
Checking for Python...Unable to build libv8: Python not found!
*** 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=/usr/local/rvm/rubies/jruby-1.6.5.1/bin/jruby
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我也尝试使用--1.9参数,强制使用另一个ruby版本,但无论如何它都失败了.即使我尝试安装libv8,但我得到了同样的错误.

有任何想法吗?我有CentOS 5.7