In article [ref] (at Sun, 27 Feb 2005 10:29:02 -0600), Quantum Scientific [off-list ref] says:

And I have looked at every single file in the Split directory, and there are 
absolutely no .diff files.  .diff files are how patch files are identified in 
*nix, of course.  I thought, maybe I should copy the kernel files into my 
kernel tree by hand, for building.  But this doesn't make sense because the 
only file under usagi-split/kernel/usagi/net/ipv6 is utils.c .  This is not 
an IPV6 stack, nor ip6tables.  I see lots of apps, which likely have the 
USAGI improvements, but no kernel stack, patch, ipv6filters, etc.  And no 
mention of patching a non-USAGI kernel.  Split 20050214 appears to be 
utilities only.

Don't you find diff files?! e.g:
  ftp://ftp.linux-ipv6.org/pub/usagi/snap/split/usagi-linux26-s20050214-2.6.11-rc3.diff.bz2
is patch against linux-2.6.11-rc3.

--yoshfuji