Log Message:
This package wants USE_TOOLS+=makeinfo, at least under my environment.
It's not exactly clear why, since the error states:

"You should only need it [makeinfo] if you modified a `.texi' or
`.texinfo' file, or any other file indirectly affecting the aspect of
the manual."

... but it's possibly a side effect of GNU_PROGRAM_PREFIX=g.  At any
rate, "makeinfo" seems a harmless request.