What causes hsc2hs "permission denied" errors during build?

[Brian Smith]

I tried to build GHC on Windows today (pulled from darcs) and I received an
error:

hsc2hs.exe: System\CPUTime_hsc_make.exe: removeFile: permission denied
(Permission denied)

make[1]: *** [System/Time.hs] Error 1
make[1]: *** Deleting file `System/Time.hs'
make: *** [boot] Error 1


I looked into the cvs-ghc mailling list archives and I see that this error
occurred very often (daily) back in March 2006. What do I need to do to
avoid this error?

Thanks,
Brian
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