Can't install therubyracer in JRuby - ruby

Question

I've installed RVM and then Jruby, this the version that i get when i type: 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]
The problem is that I can't install therubyracer gem, i get this when i try to install by jruby -S gem install therubyracer:
/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
I also tried with --1.9 parameter, to force to use another ruby version, but it fails anyway. Even I tried to install libv8, but i get the same error above.
Any ideas?
I have CentOS 5.7

Answer 1

You want the Ruby Rhino.

Answer 2

Just to clarify, in your Gemfile it's:
gem 'therubyrhino'
followed on the command line with:
jruby -S bundle install

Answer 3

I've had the same problem, but defining therubyrhino in the Gemfile didn't solve my problem, bundler kept trying to install libv8.
That happened because I defined twitter-bootstrap-rails gem in the Gemfile, and it depends on the less gem (that depends on therubyracer), so I changed the less gem to use the static branch that not depends on less (as suggested on the issue https://github.com/seyhunak/twitter-bootstrap-rails/issues/22):
gem 'twitter-bootstrap-rails', :git => "git://github.com/seyhunak/twitter-bootstrap-rails.git", :branch => "static"