XmCreateQuestionDialog(3) on Linux
The text d3eafd178d76, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
The MessageBox QuestionDialog convenience creation function "XmCreateQuestionDialog" "creation functions" "XmCreateQuestionDialog"