Reference

XtReleaseGC(3x) on Linux

The text 7b848fbce39f, as Debian 2.2 (Potato), Debian 2.1 (Slink), Debian 2.0 (Hamm), Debian 1.3 (Bo) shipped it.

obtain and destroy a sharable GC

XtReleaseGC(3x) on Linux now