gmtdigitize(1gmt) on Linux
The text 778202c33aa9, as Debian 8 (Jessie) shipped it. The page shows this text now.
Digitizing and Inverse map transformation of map x/y coordinates
Flags it lists
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-A -
-C -
-D -
-F -
-H -
-J -
-L -
-N -
-R -
-S -
-V -
-Z -
-bo -
-m