how get AmigaOS4 gcc source?

[lazer1 <lazer1 at blueyonder dot co dot uk>]

For future reference how would I get hold of 
the gcc source or diffs for Amiga OS4's gcc,

mentioned in:

http://gcc.gnu.org/ml/gcc-patches/2003-10/msg00329.html

this URL appears to have a diffs file within the message itself,

also its not clear to me what this patch is of, 

is there a mechanism to get the diffs file(s) as standalone files?

(and to know which archives are being patched)

so far I have never used CVS, if I need to use CVS what commands would 
I type for this eg from a Cygwin shell?

(note Amiga OS4 is a new PPC extension of PPC native AmigaOS 3,
AmigaOS3 was originally m68k, so Amiga OS4 is in a way a different entity to 
m68k-unknown-amigaos)

I find URL's such as the above a bit mystifying, because everyone is 
talking about some source code but there arent any download links,



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