[PATCH] Autoconf 2.64 - detect Ruby 1.9 header files

[Suraj Kurapati]

Hello,

Autoconf 2.64 generates the following line inside the ./configure
script to find the directory that contains C header files for the Ruby
language interpreter.

    RUBYDIR=`($RUBY -rmkmf -e 'print Config::CONFIG["archdir"] ||
$archdir') 2>/dev/null`

Ruby 1.8 uses "archdir" whereas Ruby 1.9 uses "rubyhdrdir".  So please
update Autoconf to generate the following line instead:

    RUBYDIR=`($RUBY -rmkmf -e 'print Config::CONFIG["rubyhdrdir"] ||
Config::CONFIG["archdir"] || $archdir') 2>/dev/null`

Thanks for your consideration.