work/root/home/user/.config/nixpkgs/config.nix

{
  packageOverrides = pkgs: with pkgs; {

    myPackages = pkgs.buildEnv {
      name = "myPackages";
      paths = [
        aspell
        bc
        clang
        coreutils
        ctags
        curl
        ffmpeg
        gdb
        gitAndTools.git-annex
        gitAndTools.git-extras
        gitAndTools.git2cl
        gitAndTools.gitFull
        gitAndTools.tig
        gnupg
        go
        jq
        nix-prefetch-scripts
        openssh
        pwgen
        qemu
        tmux
        tree
        vim
        weechat
        wget
      ];
    };

  };
}