[Bug modula2/121709] [16 regression] Failed bootstrap in m2 (m2/gm2-lang.cc:547:39: error: ‘PREFIX_INCLUDE_DIR’ was not declared in this scope)

[gaius at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121709

--- Comment #6 from Gaius Mulley <gaius at gcc dot gnu.org> ---
Many thanks for the references to cppdefault and sysroot, I'll generate a
patch.