make buildworld breaks in ncurses

[Mac Mason]

While running a make buildworld on a system that was cvsup'd to
RELENG_5_4 about an hour ago, it breaks on 

 [snip]/contrib/ncurses/ncurses/tinfo/make_keys.c

with

  /usr/obj/usr/src/sys/i386/usr/bin/ld: cannot find -lc

What's going on here? I deleted both /usr/obj and /usr/src and
re-cvs-up'd before running make buildworld, so the build should be
clean.

Help?

Thanks!

    --Mac

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