This hasn't seen a release in a couple years and isn't maintained. Are there not any actively maintained alternatives?

For this type of recompression, I believe Mozjpeg https://github.com/mozilla/mozjpeg does the same thing, but replaces libjpeg-turbo. If you don't feel it's needed, that's fine :) As usual, I packaged for my own use.

@W-Floyd What does this do that jpegoptim (jpegoptim) or jpegtran (libjpeg-turbo-devel) can't?

It micromanages jpegtran options, getting better compression levels than either of them on their own in some cases. If you don't think it's needed, that's fine :P