Package gxmessage

GTK2 based xmessage clone

http://homepages.ihug.co.nz/~trmusson/programs.html#gxmessage

Gxmassage is a GTK2 based xmessage clone. It pops up a dialog window, displays
a given message or question, then waits for the user's response. That response
is returned as the program's exit code. Because gxmessage is a drop-in
alternative to xmessage, gxmessage accepts any option xmessage would, and
returns the same exit codes.

General Commands (Section 1)
gxmessage
gxmessage opens a window to display a message obtained from the command line, from a file, or from stdin. The window includes a row of buttons, each of which...