GUB Build last step!!

[Mark]

Hey everyone,

I'm that pest that is trying to do a GUB build for a patched version of 
lilypond (which will support alternative notations (If anyone is interested 
check out http://musicnotationproject.org/)). 

Han-Wen may remember me as the chap that got lots of help from him, then 
called him "Hans" through sheer inattentiveness (way to make people feel 
appreciated Mark, I am a doofus! Sorry again Han-Wen).

I'm now at the Stage with the GUB build that I have prepared the build 
environment, and am ready to run make for all the targets. 

I was about to start hacking the make file to use my local patched version of 
lilypond to support the alternative notations. I'm a bit of a make file virgin 
so thought I should probably ask if there's an easier way to do what I want to 
do before I start hacking.

Here's my question....
Is there a easy way to make the lilypond's make file pick up a local version 
of lilypond (rather than getting everything through GIT), or should I start 
hacking the make file?

Cheers
Thanks for any help
Mark (but feel free to call me anything :)