libmagic install failure...

For a week or so no (possibly longer, the machine was DOA for a while),
I have been getting an install failure doing a `make installworld` on
-CURRENT (line wrapping below):

uniq: not found
"/usr/src/lib/libmagic/Makefile", line 49: warning: "awk '$1 == "#define" && $2 == "VERSION" { print $3 }' /usr/src/lib/libmagic/config.h | uniq" returned non-zero status

If I run the command from a normal environment it returns "4.10".  /usr/bin/uniq exists
and is in my path; /usr/obj/usr/src/usr.bin/uniq/uniq is being built and installed
properly during the buildworld/installworld steps.

I don't see any other side-effects of this error -- libmagic is being
built and installed, and the magic.5 man page has the correct version in
it.  It's just annoying cuz it ruins my pretty "whereintheworld" output
:)

Any idea what this is, or if I should be concerned?

--Mike