https://gcc.gnu.org/install/prerequisites.html has a bunch of tools
under "Tools/packages necessary for modifying GCC", but GNU Bison is
missing.
I found it interesting to see that some files like under intl say
1 /* A Bison parser, made from plural.y
2 by GNU bison 1.35. */
Not sure if that would still be able to be processed with that version
(but it definitely has some bison3 adjustments).
Back to the issue at hand: please add Bison to the list referenced
above, including its minimal version.
Kind regards,
Simon
