Hi,

I was able to build the "master" branch of ghc 8.0.1 using the instructions found here:
https://ghc.haskell.org/trac/ghc/wiki/Building/Preparation/Windows

When I switched to the "ghc-8.0" branch, though, I get the following error:

configure: error:
You've selected:
  BUILD:  x86_64-w64-mingw32   (the architecture we're building on)
  HOST:   x86_64-unknown-mingw32    (the architecture the compiler we're building will execute on)
  TARGET: x86_64-unknown-mingw32  (the architecture the compiler we're building will produce code for)
BUILD must equal HOST; that is, we do not support building GHC itself
with a cross-compiler.  To cross-compile GHC itself, set TARGET: stage
1 will be a cross-compiler, and stage 2 will be the cross-compiled
GHC.

Anyone know off the top of their heads what the issue is?

Thanks,

- Josh Berman 

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