Compiling LilyPond - question and documentation

[Phil Holmes]

I've been experimenting with putting trace messages in Lily by editing the 
source, make and then using DDD to watch what's going on.  My question:

What's the simplest way to revert to the "proper" source, rather than the 
stuff I've edited, to ensure my source tree is clean?

In doing this, I've been following the CG.  In the instructions for 
LilyBuntu it's explicit about using an out-of-tree build (using a separate 
"build" directory).  In much of the rest of the CG this seems to be ignored.

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Phil Holmes
Bug Squad