httxt2dbm(1) on macOS
The text 1bf04057c80a, as OS X 10.9.5, OS X 10.9.4, OS X 10.9.3, OS X 10.9.2, OS X 10.9.1, OS X 10.9, Mac OS X 10.8.5 shipped it.
Generate dbm files for use with RewriteMap
Flags it lists
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-f -
-i -
-o -
-v