ddd for old school programmers writing code in C

Hello.

I have been trying a while to solve the problem of installing ”ddd”, the debugger on Mac OS 10.11 through MacPorts.
It dosen't work to write
”sudo port install ddd” you get error on ”openmotif”
it doesn’t work to write
"sudo port install openmotif”
BUT
it works halfway to write

"sudo port install xorg-libXt +flat_namespace
"sudo port install openmotif”
"sudo port install ddd”
No errors

The port installation runs smoothly but when I try to start ”ddd &” i get
[1] 85510
gustengrens-Mac-mini:~ ulfdahgustengrenlgren$ Creating "/Users/ulfdahgustengrenlgren/.ddd/"...
Creating "/Users/ulfdahgustengrenlgren/.ddd/"...done.
Creating "/Users/ulfdahgustengrenlgren/.ddd/sessions/"...
Creating "/Users/ulfdahgustengrenlgren/.ddd/sessions/"...done.
Creating "/Users/ulfdahgustengrenlgren/.ddd/themes/"...
Creating "/Users/ulfdahgustengrenlgren/.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] <mailto:[email protected]>>, giving a subject like

    DDD 3.3.12 (i386-apple-darwin15.6.0) 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
So i still can’t use the nice ddd debugger for c-programming

/Gusten Gren