Ruby on Rails

I have installed growl on Windows XP
It looks like the software only support Mac OS, how to solve the problem
on
Windows XP? Thank you.

$ gem install autotest-fsevent -v 0.2.4
Building native extensions. This could take a while...
ERROR: Error installing autotest-fsevent:
ERROR: Failed to build gem native extension.

/usr/bin/ruby.exe extconf.rb
extconf.rb:19: Only Darwin (Mac OS X) systems are supported
(RuntimeError)

Gem files will remain installed in
/usr/lib/ruby/gems/1.8/gems/autotest-fsevent-0.2.4 for inspection.
Results logged to
/usr/lib/ruby/gems/1.8/gems/autotest-fsevent-0.2.4/ext/fsevent/gem_make.out

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