giftrans(1) on Linux
The text 9ece04c8d3d6, as Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
transform gif from gif87 to gif89, making one color transparent
Flags it lists
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-B -
-C -
-L -
-T -
-V -
-b -
-c -
-e -
-g -
-h -
-l -
-o -
-t