After reading

  http://gcc.gnu.org/install/specific.html#mips-x-x

I tried to link the problematic (crashing) postgres binary directly
from the *.o files to circumvent the SUBSYS.o dance and I've got a
working postgres binary and finally working postgres82-server package!
:-)

(Anybody interested in this packag? Maybe I can upload it
somewhere...)

So, the problem seems to be a GNU linker/binutils mips problem with
NetBSD's in tree version.

Is there an easy way to use more actual GNU binutils versions under
NetBSD to verify that these version solve the problem?

Does it make sense to send-pr about this?

Markus.