How do I cross-compile a flake?

[doronbehar]

I think it’ll be helpful to link here another solution from this forum I found simpler and helpful for my purpose:

How do I cross compile my own package (rather than something in nix-pkgs)

First you need to separate your nix file in two files, one that does callPackage on the other: default.nix: { pkgs ? import <nixpkgs> {} }: pkgs.callPackage ./myapp.nix {} and ./myapp.nix: { stdenv, SDL2 }: mkDerivation { ... } Then check that it still builds. Then to cross compile, replace usage of pkgs.callPackage by pkgs.pkgsCross.mingw64.callPackage. Good luck

Basically, it instructs to use pkgs.pkgsCross.<targetSystem>.callPackage which gives you the power of nixpkgs’ cross compilation override system, along with the familiar and comfortable also for flakes interface of an expression file to which you callPackage.