Is there an option --use-x-height for otftotfm?

Question

I am converting a font and otftotfm tells me:

otftotfm.exe: warning: font x-height and height of 'x' differ by 100%
(The height of 'x' is usually more reliable than the x-height, so I'm
using that. Or try --use-x-height or --no-use-x-height

However when I add --use-x-height to my list of arguments, I get:

otftotfm.exe: unrecognized option '--use-x-height'

And this option is also not documented in https://www.lcdf.org/type/otftotfm.1.html

So my question is, is there an option called --use-x-height and what am I doing wrong applying it?

Answer 1

The option name in the warning is wrong, you should use the option --x-height=font instead. Alternatively you can use --x-height=x to explicitly use the height of the x without showing a warning.