MAME Compiler 64 and an error.. HELP?!

[Games001]

Maybe you folks can tell me where I have made a mistake in my MAME v123 Compile attempt:

Directory Structure:
MinGW in    C:\MinGW
MAME Source in    Z:\MAME
Diff/Hi Patch in C:\MinGW\Patches
GameEX (reg'd) in    C:\Games\GameEX

When I attempt to patch the first 0123u1.diff I get this report on each notice:

Applying Diff Patch...
can't find file to patch at input line 4
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
--------------------------
|diff -Nru src-old/build/build.mak src/build/build.mak
|--- src-old/build/build.mak   2008-01-27 12:19:32.000000000 -0800
|+++ src/build/build.mak   2008-02-12 23:40:12.000000000 -0800
--------------------------
File to patch:
Skip this patch? [y]
Skipping patch.
3 out of 3 hunks ignored
can't find file to patch at input line 55
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
--------------------------
(example taken from first few lines of Compile Output notes)

Where have I gone wrong?

Thanks all.


Fixed, thanks to B.H. from the GameEX forums