From: Brian Candler <lists@...>
Date: 2012-08-08T00:05:56+09:00
Subject: Re: The source of RUBY_PLATFORM

Probably from uname -o

This is in the source for ruby-1.8.7-p352:

$ grep RUBY_PLATFORM configure
#define RUBY_PLATFORM __ARCHITECTURE__ "-${target_os}"
#define RUBY_PLATFORM "${arch}"

And target_os is determined by autoconf. See
http://sources.redhat.com/autobook/autobook/autobook_261.html

autoconf is a mess of shell scripts and m4, have fun digging through 
them :-)

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