If script executing locally- do this, if remote-do that

Question

hello everyone,
  need some advice on the best way to do this, not sure if some logic like this is even needed, i may be over thinking it.
First a little background:
I have a clipbucket 2.6 site.  works great on remote.  when i install with xampp on my personal computer errors being thrown of
Call to undefined method ADODB_mysql::select()
now i found a fix for this on their site, it is to change a line in their code:
require 'adodb/adodb.inc.php';
to something that will reference the file correctly in a local environment.  some people suggest
require '/FULL PATH TO/adodb/adodb.inc.php';
but that does not work for me, i get errors of not being able to find file, turns out it only works on wamp or lampp, i use xampp
THIS is what works on my local xampp test server:
require 'C:\xampp\htdocs\videoz\includes\adodb\adodb.inc.php';
NOW MY QUESTION:
require 'C:\xampp\htdocs\videoz\includes\adodb\adodb.inc.php';
will not work on remote to reference the file correctly.
How can i make some logic to decide if a script is being executed on local or remote and include a filepath accordingly?
if file exists?
server root?
suggestions?'
ideas?
is this even the right way to go about this?  I cant figure out a way to scructure the include to work with both, i have it disabled to use variables in include statements (whatever its called), ha
any suggestions on how to do this effectively and most importantly safely??
thanks a ton for your attention!

Answer 1

as i tried to explain in my first post, (maybe not all that well but i tried) the path to the file is different on the remote and localhost.  Normally a file refrence can be structured to not make this a big deal.  But in this particular situation xampp does not recognize the short path or the FULL PATH TO way of doing things.  I agree it sucks, but it is what it is.  as long as the if else is structured effeciently and securely, it would make a cross platform solution.  Plus some poeple only use the clipbucket cms locally, kindof like a picture album, this way they can use it too.
Thanks Rob, thats kindof what I was leaning towards, just wasnt sure if there was a better way of doing it.  This topic i found a few places on the clip bucket forum and neither of them had a solid cross platform solution.  Just thought id check with the adobe crowd before i posted a solution.
My final code if anyone is curious:
if($_SERVER['DOCUMENT_ROOT'] !== 'C:/xampp/htdocs')     
//works for remote     
require 'adodb/adodb.inc.php';     
}else{     
//works for localhost     
require 'C:\xampp\htdocs\videoz\includes\adodb\adodb.inc.php';    
Thanks a lot everyone!