[2022] devsetup local development environment based on pkgsrc

pkgsrc is the official source of software packages for NetBSD and SmartOS; that much is clear. It has the focus of developers and users on these two platforms, and it is expected to work well there. In this model, pkgsrc is typically used in privileged mode (the default) where the packages are installed and managed by the system administrator: users and groups are created for packages as required, additional services are provided and can be registered with the Operating System. Another selling point for pkgsrc is its portability, since it is available and also working well on a number of other platforms: Linux distributions, FreeBSD (and derivatives like DragonFlyBSD), OpenBSD, or macOS are also supported. But on all of the platforms mentioned, pkgsrc can now also work just as well in unprivileged mode. In this mode, any local user with a C compiler can clone pkgsrc, build packages, and manage these packages themselves, by themselves, for themselves. Thanks to the introduction of the