ELF binary type "3" not known.

I'm not sure which of the two lists I'm directing
this to is the best/correct one. So I picked both.

To the point; I received this message during a big
build session. I was only able to catch the one from
x11/nvidia-driver in such a way as to actually get
the entire message:

Installing nvidia-driver-375.26_1...
ELF binary type "3" not known.
/bin/sh: /compat/linux/sbin/ldconfig: Exec format error

I built && installed emulators/linux_base-c7 *prior*
to installing this. This is on a:

FreeBSD 12.0-CURRENT FreeBSD 12.0-CURRENT #0 r314700:
Sun Mar 5 09:01:30 PST 2017 amd64

Should I anticipate any problems? All and all, it seems
to work. But are there going to be some subtle repercussions?

Is this a 32bit-v-64bit problem with linux_base || the nvidia
blob?

Thanks.

--Chris