'screen' error: "Must be connected to a terminal"

["Karsten M. Self" <kmself@ix.netcom.com>]

See subject.

When I invoke screen as an unpriviledged (ordinary) user, I get the
following error:

    [karsten@navel:karsten]$ screen
    Must be connected to a terminal.

I *can* invoke screen as a root user.  I note that the binary is
installed SGID utmp:

    [karsten@navel:karsten]$ ll $( which screen )
    -rwxr-sr-x   1 root   utmp     235164 Sep 12 21:18 /usr/bin/screen

Anyone else seeing this, or have a fix?

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