adding document include path to working shtml config

adding document include path to working shtml config in Apache 1.3.x

I have server side includes working but would like to set a path for include statements to look in
--other than current directory--. i.e. If the #include file doesn't insist in the current
directory, look in "/includes" relative to the document root. Since it's after midnight, and
I've been reading the fine manual all day, I was hoping one of you might give me a hint.

If there are any old "C" programmers reading, what I'm looking for would be more-or-less
equivilent to telling a "C" compiler where I have my toolbox header files for compiler parsed
directives.

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