[Axiom-developer] How do I apply a patch?

[Alasdair McAndrew]

Sorry if this has been covered before... I'm using the axiom linux
binary - how do I apply a patch, or add a patch of my own?  Is it just
a matter of changing the .spad file in

/usr/local/axiom/mnt/linux/src/algebra

or do I need to do some sort of recompiling?  If this is a dumb
question, I humbly apologize, but I still don't know how to do it...

Thanks,
Alasdair