alastairblyth@Alastairs-MacBook-Pro example % which ddd
/usr/local/bin/ddd
alastairblyth@Alastairs-MacBook-Pro example % ddd spline_example
Warning: locale not supported by Xlib, locale set to C
Warning: X locale modifiers not supported, using default
Creating "/Users/alastairblyth/.ddd/"...
Creating "/Users/alastairblyth/.ddd/"...done.
Creating "/Users/alastairblyth/.ddd/sessions/"...
Creating "/Users/alastairblyth/.ddd/sessions/"...done.
Creating "/Users/alastairblyth/.ddd/themes/"...
Creating "/Users/alastairblyth/.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 <ddd@gnu.org>, giving a subject like
DDD 3.3.12 (i386-apple-darwin21.5.0) 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.
We thank you for your support.
--------------------------------------------
This is the .ddd/log file :
GNU DDD 3.3.12 (i386-apple-darwin21.5.0)
Copyright (C) 1995-1999 Technische Universit<E4>t Braunschweig, Germany.
Copyright (C) 1999-2001 Universit<E4>t Passau, Germany.
Copyright (C) 2001 Universit<E4>t des Saarlandes, Germany.
Copyright (C) 2001-2009 Free Software Foundation, Inc.
Compiled with GCC Apple LLVM 13.1.6 (clang-1316.0.21.2.5)
Requires X11R6, Xt11R7, Motif 2.3.8 (Motif Version 2.3.8)
Includes XPM 3.4.11, Athena Panner (7000002L), Manual, App defaults, DDD
core
Built 2022-05-30 by (unknown).
$ ddd spline_example
! Xt error: Unresolved inheritance operation
! Xt error
! Cannot save options