The enable-executable-static flag is set by default, so doesn't make a difference.
The pkg-config improvement for libpq was merged upstream, so we can use the same
here already.
This makes the static build fail in case any references to the nix store
are left over. Those will increase the closure size of the nix derivation
massively and lead to a huge docker image.
At the same time, those references will not be functional on non-nix systems,
to which the static executable is distributed, anyway.
Wolfgang Walther