DDD 3.3.12 (i386-apple-darwin17.3.0) gets Xt error (Unresolved inheritance operation)

I was attempting to run DDD, which I installed with Homebrew, when this
message was produced. The log, which I have also attached, reads as
follows: Thank you very much

GNU DDD 3.3.12 (i386-apple-darwin17.3.0)

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 4.2.1 Compatible Apple LLVM 9.0.0 (clang-900.0.39.2)

Requires X11R6, Xt11R6, Motif 2.3.8 (Motif Version 2.3.8)

Includes XPM 3.4.11, Athena Panner (7000002L), Manual, App defaults, DDD
core

Built 2018-03-13 by (unknown).

$  ddd

!  Xt error: Unresolved inheritance operation

!  Xt error

!  Cannot save options





Could you please advise?

Kind Regards,

Solomon Denham