Mavericks installer says my primary disk is used for Time Machine . . . but it isn't. Won't install.

I've downloaded Mavericks, but the istaller says my primary HD -- used for OS and files -- is used for Time Machine and Mavericks can't be installed.
Primary does NOT have TM files on it . . . it's on a separate, dedicated HD.
What can I do?

OS X v10.6, OS X Lion- Cannot install Mac OS X v10.6 or later on a volume used by Time Machine for backups
OS X- Cannot install on a volume used by Time Machine for backups

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