Finding config settings in windows

Hey All.
I'm trying to figure out why the ruby.h dir is not giving me the right
location using RbConfig in Ruby 1.9.3 on Windows.

I ran irb
>> loc = File.join( Config::CONFIG['archdir'], 'ruby.h')
=> "C:/Ruby193/lib/ruby/1.9.1/i386-mingw32/ruby.h"

# No deprecation warning as below would.
but that's not where it is.

So I ran
>> RbConfig::CONFIG.each { | k, v | puts "#{k} => #{v}\n" }
and found
includedir => C:/Ruby193/include

which is where it is.

The reason I ask is that from the book Ruby Cookbook
I'm trying to get the first example from "chapter 22.1 Writing a C
Extension for Ruby" to compile with make. I have devkit set up okay I
think. But that RbConfig::Config has me confused as to why it points to
the wrong directory.

I run
ruby extconf.rb
and get my makefile

Then I run make
and get this error
make.exe: *** No rule to make target
`/C/Ruby193/include/ruby-1.9.1/ruby.h', needed by `example.o'.  Stop.

Can anyone help me?
Is there a way to set the config for the correct directory even if this
is not what the problem is?

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