Comment by Ericson2314

On Nixpkgs master, you can cross compile to MinGW and Cygwin.

Native Cygwin builds are also currently in progress: https://github.com/NixOS/nixpkgs/pull/447520. I would expect this to be done very soon, there year even (holidays permitting).

There is a MinGW build of Nix but it is missing some features. There has been MSVC build of a fork in the past and I would like to revive that also.

There some some open questions relating to Nixpkgs's heavy use of Bash, but longer term I would like to compete for Windows in all ways:

- Support all cross (MinGW, Cygwin/MSYS2, MSVC ABI with LLVM, MSVC with Wine) - Be Cygwin packages - Be https://github.com/msys2/MINGW-packages / https://github.com/msys2/MSYS2-packages - Be VCPKG

All these things have slightly different trade-offs, and Nixpkgs is very good at portability, so we should simply do them all.