On Tuesday, 4 January 2022 at 21:22:26 UTC, Ben Jones wrote:
  * frame #0: 0x0000000000000000

That's null, meaning the library wasn't loaded.

simpledisplay actually doesn't need -lX11 since it always dynamic loads the libraries. Normally it throws when this fails though instead of keeping null but that check is also initialized in a static constructor....

With your different build process though, do you still have a D main? If druntime is not fully initialized these libs won't load nor will it set the success flag. So that'd leave null.

You can also quite possibly try to load it yourself:

        xlib.loadDynamicLibrary();
        xext.loadDynamicLibrary();

in your main and see if it works. Then the variable to check is `if(!librariesSuccessfullyLoaded)` and see if it set it up.

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