[Haskell-cafe] Building 32-bit binaries on a 64-bit system?

I've got someone who wants to run one of my haskell apps on a 32-bit Windows 10 box. I've pretty much moved to 64-bit everywhere, so don't have such a system to build on. Is it possible to get stack/cabal/ghc to build a 32-bit Windows binary on a 64-bit Windows box? Google found a bunch of things about building 64 bit applications, and the ghc manual doesn't seem to have such an option. So do I need to get a 32-bit system for this?