Where is HsTimeConfig.h?

I'm trying to build Ashley's time package with GHC6.4 on Windows XP, and there are a few things it uses which seem to be in GHC6.6 only. Some of them I can find in the GHC sources, but I am unable to locate HsTimeConfig.h. When GHC is installed I'd expect to find it under C:\ghc\ghc-6.4.1\include, but I can't tell where this maps to in the ghc source tree. Thanks, Alistair