xv6 dev env for nixos

flake.nix

{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs { inherit system; };
        riscv64-pkgs = pkgs.pkgsCross.riscv64;
      in {
        devShell = riscv64-pkgs.mkShell {
          nativeBuildInputs = with pkgs; [ gcc gdb qemu perl python3 ];
        };
      });

}