Compiling darcs-2.0.0 on Windows which has GHC 6.8.2 installed, I get  
this error:

[ghc] src/Darcs/Resolution.o
[ghc] src/Darcs/Repository/Internal.o
[ghc] src/Darcs/Repository/Checkpoint.o
[ghc] src/Darcs/Repository.o
[ghc] src/Darcs/Arguments.o

src/Darcs/Arguments.lhs:88:39:
     Warning: Imported from `Darcs.Hopefully' but not used: `info'

src/Darcs/Arguments.lhs:89:65:
     Warning: Imported from `Darcs.Patch' but not used:
                `list_touched_files'

src/Darcs/Arguments.lhs:90:0:
     Warning: Module `Darcs.Patch.Info' is imported, but nothing from  
it is used,
                except perhaps instances visible in `Darcs.Patch.Info'
              To suppress this warning, use: import Darcs.Patch.Info()

src/Darcs/Arguments.lhs:94:0:
     Warning: Module `Darcs.Progress' is imported, but nothing from  
it is used,
                except perhaps instances visible in `Darcs.Progress'
              To suppress this warning, use: import Darcs.Progress()

src/Darcs/Arguments.lhs:107:17:
     Warning: Imported from `Printer' but not used: `renderString'

src/Darcs/Arguments.lhs:107:52:
     Warning: Imported from `Printer' but not used: `vcat'
make: *** [src/Darcs/Arguments.o] Error 1

real    1m28.537s
user    0m7.830s
sys     0m6.010s

Now I do have cygwin installed, and I am using cygwin bash to invoke  
make, but this should not be able to cause these problems.

Regards,

Zooko

this is a duplicate of issue789 (all of my e-mails to bugs@darcs.net appear to
result in two identical issues...)