DDD 3.4.0 (x86_64-apple-darwin19.6.0) gets Xt error

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GNU DDD 3.4.0 (x86_64-apple-darwin1    9.6.0)
Copyright (C) 1995-1999 Technische GNU DDD 3.4.0 (x86_64-apple-darwin19.6.0)
Copyright (C) 1995-1999 Technische Universit?t Braunschweig, Germany.
Copyright (C) 1999-2001 Universit?t Passau, Germany.
Copyright (C) 2001 Universit?t des Saarlandes, Germany.
Copyright (C) 2001-2009 Free Software Foundation, Inc.

Compiled with GCC Apple LLVM 12.0.0 (clang-1200.0.32.29)
Requires X11R6, Xt11R7, Motif 2.3.8 (Motif Version 2.3.8)
Includes Athena Panner (7000002L), Manual, App defaults, DDD core
$  ddd
!  Xt error: Unresolved inheritance operation
!  Xt error
!  Cannot save options

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<div dir=3D"ltr">GNU DDD 3.4.0 (x86_64-apple-darwin1 =C2=A0 =C2=A09.6.0)<br=
>Copyright (C) 1995-1999 Technische GNU DDD 3.4.0 (x86_64-apple-darwin19.6.=
0)<br>Copyright (C) 1995-1999 Technische Universit?t Braunschweig, Germany.=
<br>Copyright (C) 1999-2001 Universit?t Passau, Germany.<br>Copyright (C) 2=
001 Universit?t des Saarlandes, Germany.<br>Copyright (C) 2001-2009 Free So=
ftware Foundation, Inc.<br><br>Compiled with GCC Apple LLVM 12.0.0 (clang-1=
200.0.32.29)<br>Requires X11R6, Xt11R7, Motif 2.3.8 (Motif Version 2.3.8)<b=
r>Includes Athena Panner (7000002L), Manual, App defaults, DDD core<br>$ =
=C2=A0ddd<br>!=C2=A0 Xt error: Unresolved inheritance operation<br>!=C2=A0 =
Xt error<br>!=C2=A0 Cannot save options<br><div><br></div></div>

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