itclcomponent(3itcl) on Linux
The text 66b0917e569e, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster) shipped it. The page shows this text now.
define components for extendedclass, widget or widgetadaptor Parts of this description are "borrowed" from Tcl extension [snit], as the functionality is mostly identical.