This happens with "2.2.0 (release)" and "2.3.1 (release)", so I don't think
it's a duplicate of issue #1043 or #1198.
Eyeballing the output, I'm really not sure what the conflict might be...help!?!?
Yikes! Any chance at all you could make the repository available to us (even if
privately) so that we could boil it down into a minimal test case?
In the mean time: you need a workaround. Unfortunately, I think that means (1)
using Darcs to merge in all patches that don't affect the file
./410kern/simics/simics.h (2) using diff+patch for the rest :-(
Just an update on this: Dave has very kindly agreed to take on some forensics as
described in http://wiki.darcs.net/Forensics when he has a spare moment (which
may not be for another couple of weeks or so).