Reference

XtUnregisterDrawable(3x) on Linux

The text ae54bfeae51e, as Debian 2.2 (Potato), Debian 2.1 (Slink), Debian 2.0 (Hamm), Debian 1.3 (Bo) shipped it.

register a drawable with the Intrisics event dispatcher

XtUnregisterDrawable(3x) on Linux now