No se puede instalar therubyracer, error

Estoy intentando instalar therubyracer / therubyracer-heroku en mi aplicación, porque no funciona en el servidor de heroku porque no tengo un entorno de tiempo de ejecución de JavaScript.
Cuando bash instalar estas gems escribe:

Installing therubyracer-heroku (0.8.1.pre3) with native extensions C:/RailsInsta ller/Ruby1.9.2/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:533:in `rescue in block in build_extensions': ERROR: Failed to build gem native extension. (Gem::I nstaller::ExtensionBuildError) C:/RailsInstaller/Ruby1.9.2/bin/ruby.exe extconf.rb rm -rf build mkdir -p build cp -r scons build mkdir -p build/scons/install python build/scons/setup.py install --prefix=install make: python: Command not found make: *** [build/scons/install/bin/scons] Error 127 *** 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/Ruby1.9.2/bin/ruby extconf.rb:9:in `': Error compiling V8 (RuntimeError) Compiling V8 Gem files will remain installed in C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9 .1/gems/therubyracer-heroku-0.8.1.pre3 for inspection. Results logged to C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/therubyra cer-heroku-0.8.1.pre3/ext/v8/gem_make.out from C:/RailsInstaller/Ruby1.9.2/lib/ruby/site_ruby/1.9.1/rubygems/insta ller.rb:511:in `block in build_extensions' from C:/RailsInstaller/Ruby1.9.2/lib/ruby/site_ruby/1.9.1/rubygems/insta ller.rb:486:in `each' from C:/RailsInstaller/Ruby1.9.2/lib/ruby/site_ruby/1.9.1/rubygems/insta ller.rb:486:in `build_extensions' from C:/RailsInstaller/Ruby1.9.2/lib/ruby/site_ruby/1.9.1/rubygems/insta ller.rb:159:in `install' from C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.18 /lib/bundler/source.rb:101:in `block in install' from C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.18 /lib/bundler/rubygems_integration.rb:78:in `preserve_paths' from C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.18 /lib/bundler/source.rb:91:in `install' from C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.18 /lib/bundler/installer.rb:58:in `block (2 levels) in run' from C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.18 /lib/bundler/rubygems_integration.rb:93:in `with_build_args' from C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.18 /lib/bundler/installer.rb:57:in `block in run' from C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.18 /lib/bundler/installer.rb:49:in `run' from C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.18 /lib/bundler/installer.rb:8:in `install' from C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.18 /lib/bundler/cli.rb:220:in `install' from C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.18 /lib/bundler/vendor/thor/task.rb:22:in `run' from C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.18 /lib/bundler/vendor/thor/invocation.rb:118:in `invoke_task' from C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.18 /lib/bundler/vendor/thor.rb:263:in `dispatch' from C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.18 /lib/bundler/vendor/thor/base.rb:386:in `start' from C:/RailsInstaller/Ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.18 /bin/bundle:13:in `' from C:/RailsInstaller/Ruby1.9.2/bin/bundle:19:in `load' from C:/RailsInstaller/Ruby1.9.2/bin/bundle:19:in `' 

Gracias por adelantado

Que yo sepa, therubyracer (-heroku) simplemente no funciona en Windows. Pero Windows tiene su propio motor de JavaScript, que los ejecutivos deben poder localizar. Así que eso debería funcionar para su desarrollo en Windows.

Para servir la aplicación en Heroku, puede agregar la gem therubyracer-heroku de la siguiente manera:

 gem 'therubyracer-heroku', '~> 0.8.1.pre3', :platform => :ruby 

:platform => :ruby lo usará en C Ruby (MRI) o Rubinius pero no en Windows.

También, vea los documentos de Heroku para la stack de cedro ;

Si anteriormente utilizaba therubyracer o therubyracer-heroku , estas gems ya no son necesarias y se desaconsejan, ya que estas gems utilizan una gran cantidad de memoria.