gmtdigitize(1gmt) on Linux
The text f63549cbc9e3, as Debian 5.0 (Lenny) shipped it.
Digitizing and Inverse map transformation of map x/y coordinates
Flags it lists
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-A -
-C -
-D -
-F -
-H -
-J -
-L -
-M -
-N -
-R -
-S -
-V -
-Z -
-bo