Windows XP
Ruby 1.8.2

I'm having a bit of trouble building a proper gem for one of the
Win32Utils packages (win32-ipc).  This is a C extension.  Everything
appears to be fine, except that it installs the shared library (.so)
under "lib", instead of "lib/win32".  I've set the Gem#required_paths,
so I'm not sure what I'm doing wrong.

Here is the spec:

require "rubygems"

spec = Gem::Specification.new do |gem|
        gem.name         = "win32-ipc"
        gem.version      = "0.4.1"
        gem.author       = "Daniel J. Berger"
        gem.email        = "djber...@gmail.com"
        gem.homepage     = "http://www.rubyforge.org/projects/win32utils"
        gem.platform     = Gem::Platform::WIN32
        gem.summary      = "A base class for Win32 synchronization objects."
        gem.require_paths << "lib/win32"
        gem.test_file    = "test/tc_ipc.rb"
        gem.has_rdoc     = true
        gem.extra_rdoc_files  = ["CHANGES","README"]
        gem.extensions        = ["extconf.rb"]
        gem.rubyforge_project = "win32utils"

        files = Dir["doc/*"] + Dir["examples/*"] + Dir["lib/win32/*"]
        files += Dir["test/*"] + Dir["[A-Z]*"]
        files.delete_if{ |item| item.include?("CVS") }
        gem.files = files
end

if $0 == __FILE__
        Gem.manage_gems
        Gem::Builder.new(spec).build
end

The result is ipc.so installed under
c:/ruby/lib/ruby/gems/1.8/gems/win32-ipc-0.4.1-mswin32/lib instead of
the desired
c:/ruby/lib/ruby/gems/1.8/gems/win32-ipc-0.4.1-mswin32/lib/win32.

Any ideas?  I've tried a few things for 'required_libs' without
success.

Regards,