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There is known issue with Windows and Python https://github.com/cowboyd/libv8/issues/29

in case you are seeing this error:

Installing libv8 (3.3.10.4) with native extensions
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

d:/RailsInstaller/Ruby1.9.3/bin/ruby.exe 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=d:/RailsInstaller/Ruby1.9.3/bin/ruby
Checking for Python...Unable to build libv8: Python not found!