The nixpkgs-unstable channel's programs.sqlite was used to identify
packages producing exactly one binary, and these automatically added
to their package definitions wherever possible.
vpn-slice has different requirements for externally available
commands depending on the os:
> Supported OSes:
> - Linux kernel 3.x+ with iproute2 and iptables utilities (used for all routing setup)
> - macOS 10.x with BSD route
Those executables are needed for correct operation of vpn-slice
during runtime. Otherwise the error message "cannot execute
/sbin/ip" / "cannot execute /sbin/iptables" occurrs.
