build failure on mac

[Greg Troxel <gdt%ir.bbn.com@localhost>]

I'm getting the following when building on a mac (10.7):

--- dependall-mdsetimage ---
nbmake: nbmake: don't know how to make /usr/lib/libz.a. Stop

This persisted after removing the tools objdir and tools dir.

I have the impression this does not show up when building on NetBSD.
Perhaps there is some new host/build cross leakage?

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