DDD 3.3.12 (i386-apple-darwin14.5.0) gets Xt error

Hello,

I got this on first startup after installing DDD through Macports. It won’t run at all. Macports already knows about it; I’m not the first.

Lachlan

╭─[email protected] ~
╰─➤  ddd
Creating "/Users/lachlan/.ddd/"...
Creating "/Users/lachlan/.ddd/"...done.
Creating "/Users/lachlan/.ddd/sessions/"...
Creating "/Users/lachlan/.ddd/sessions/"...done.
Creating "/Users/lachlan/.ddd/themes/"...
Creating "/Users/lachlan/.ddd/themes/"...done.
Error: Unresolved inheritance operation

Xt error (Unresolved inheritance operation).

Oops!  You have found a bug in DDD.

If you can reproduce this bug, please send a bug report
to <[email protected]>, giving a subject like

    DDD 3.3.12 (i386-apple-darwin14.5.0) gets Xt error

To enable us to fix the bug, you should include the following information:
* What you were doing to get this message.  Report all the facts.
* The contents of the `~/.ddd/log' file as generated by this session.
Please read also the section "Reporting Bugs" in the DDD manual.


=================================================================================================
Logfile:

╭─[email protected] ~/.ddd
╰─➤  cat log
GNU DDD 3.3.12 (i386-apple-darwin14.5.0)
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 7.0.2 (clang-700.1.81)
Requires X11R6, Xt11R6, Motif 2.3.4 (Motif Version 2.3.4)
Includes XPM 3.4.11, Athena Panner (7000002L), Manual, App defaults, DDD core
Built 2016-07-19 by (unknown).
$  ddd
!  Xt error: Unresolved inheritance operation
!  Xt error
!  Cannot save options