DDD 3.3.12 (i386-apple-darwin16.3.0) gets Xt error

[Stéphane Faroult]

roughseas-MacBook-Air:~ roughsea$ brew install ddd
Updating Homebrew...
==> Auto-updated Homebrew!
Updated 2 taps (caskroom/cask, homebrew/core).
==> Updated Formulae
antigen      kobalt       mkvtoolnix   parallel     sdcv         weechat
h2o          meson        mpv          pmd          vim

==> Installing dependencies for ddd: openmotif
==> Installing ddd dependency: openmotif
==> Downloading https://homebrew.bintray.com/bottles/openmotif-2.3.7.sierra.bott
######################################################################## 100.0%
==> Pouring openmotif-2.3.7.sierra.bottle.tar.gz
🍺  /usr/local/Cellar/openmotif/2.3.7: 1,245 files, 15.8MB
==> Installing ddd
==> Downloading https://homebrew.bintray.com/bottles/ddd-3.3.12_1.sierra.bottle.
######################################################################## 100.0%
==> Pouring ddd-3.3.12_1.sierra.bottle.tar.gz
🍺  /usr/local/Cellar/ddd/3.3.12_1: 45 files, 4.4MB
roughseas-MacBook-Air:~ roughsea$ ddd
Creating "/Users/roughsea/.ddd/"...
Creating "/Users/roughsea/.ddd/"...done.
Creating "/Users/roughsea/.ddd/sessions/"...
Creating "/Users/roughsea/.ddd/sessions/"...done.
Creating "/Users/roughsea/.ddd/themes/"...
Creating "/Users/roughsea/.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 <address@hidden>, giving a subject like

    DDD 3.3.12 (i386-apple-darwin16.3.0) 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.

ddd: Cannot save options