[Asterisk-Users] Any way to not overwrite sound files on compile?

[Matt]

Every time I recompile Asterisk (or upgrade to a new CVS-HEAD,
whatever) asterisk overwrites custom files I have made.  Granted,
these files are named the same as the asterisk default files
(vm-login.gsm, etc) because we had a person here record them to
customize them a bit more for our application.

Short of keeping them somewhere and copying them back every time
(which isn't all that often) I do a re-compile.  Is there some flag or
something to tell Asterisk not to install sound files, or at the very
least not to overwrite ones already existing?