Neither this nor catclock-git build for me -
/usr/include/X11/Intrinsic.h:999:5: note: expected ‘XtTimerCallbackProc’ {aka ‘void (*)(void *, long unsigned int *)’} but argument is of type ‘void (*)(struct _WidgetRec *, int)’
999 | XtTimerCallbackProc /* proc */,
| ^~~~~~~~~~~~~~~~~~~
make: *** [Makefile:46: xclock] Error 1
==> ERROR: A failure occurred in build().
Aborting...
