my nix-shell attempt

shell.nix

{ pkgs ? import <nixpkgs> { } }:

let
  fhs = pkgs.buildFHSUserEnvBubblewrap {
    name = "SkiffOS-fhs";
    targetPkgs = pkgs: (with pkgs;
      [
        bc
        binutils
        bzip2
        chrpath
        cpio
        diffstat
        expect
        gcc
        gdb
        git
        gnumake
        texinfo
        hostname
        kconfig-frontends
        lzma
        m4
        ncurses6
        patch
        perl
        python3
        rsync
        rpcsvc-proto
        unzip
        util-linux
        wget
        lz4
        which
      ]);
    multiPkgs = null;
    extraOutputsToInstall = [ "dev" ];
    profile =
      ''
#        patchShebangs *
        export NIX_DONT_SET_RPATH="1"
        export SKIFF_WORKSPACE=rpi0-test
        export SKIFF_CONFIG=pi/0,skiff/core
        #make configure
#        sed -i 's,/usr/bin/file,${pkgs.file}/bin/file,g' buildroot/support/dependencies/dependencies.sh
      '';
  };
in
fhs.env