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I'd like to debug a cython program (following this tutorial). To do so, I need ddd. So, I run the following command: brew install ddd but when the command ddd python3 leads to:

Error: Can't open display:

What can I do to have more information on what is the problem and identify where it is coming from ?

MarcoMag
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1 Answers1

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I don't use ddd, but it appears to need X11, i.e. an X Windows server. As Macs no longer come with an X11 server, you'd need to install XQuartz which you can obtain here.

Also, I would imagine you need:

brew install ddd

rather than:

brew uninstall ddd
Mark Setchell
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  • It was a typo, I edited the question. I did install XQuartz, but nothing changed – MarcoMag Jul 19 '18 at 19:29
  • no. I just checked with a simple `xclock -digital` and I again get `Error: Can't open display:` – MarcoMag Jul 19 '18 at 19:41
  • Well, if `xclock` won't run, your X setup is incorrect. Have you rebooted since installing XQuartz? Have you set DISPLAY or not? Have you tried manually starting X11 from Finder->Applications before starting `xclock`? – Mark Setchell Jul 19 '18 at 19:46
  • After a reboot, xclock is now working. When trying to excecute the command `ddd python3`, I now have the following error:`ddd python3 Warning: locale not supported by Xlib, locale set to C 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 , giving a subject like DDD 3.3.12 (i386-apple-darwin17.3.0) gets Xt error` – MarcoMag Jul 20 '18 at 06:25
  • I'm approaching the limits of my knowledge now. This may help https://stackoverflow.com/a/8161863/2836621 – Mark Setchell Jul 20 '18 at 07:14
  • I tried what you just suggest. Unfortunately, this does not solve the problem. Thanks for your help. I will post the solution to this problem if I manage to find one :) – MarcoMag Jul 20 '18 at 07:20