I just experienced exactly the same problem as thelatemrb, the solution worked for me.
I'm on a Debian Linux box with astyle 2.03, and no wine. Its a x86_64 server environment and I don't want to install x86 multilib (32bit-wine) for that, it would be great if that could be fixed! I never had that problem before, on OpenSuse I've got wine installed and that just worked.
== Reformating client ==
> Cleaning sources
> Replacing OpenGL constants
> Reformating sources
'astyle --suffix=none --quiet --options=conf/astyle.cfg src/minecraft/*.java src/minecraft/net/minecr...' failed : 1
Decompile failed
/edit looks like forge already fixed it, but mcp (8.04) not