[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)

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

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

--- Comment #2 from Sam James <sjames at gcc dot gnu.org> ---
```
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/build $ grep -rsin
PREFIX_INCLUDE_DIR
gcc/auto-host.h:2533:/* #undef PREFIX_INCLUDE_DIR */
prev-gcc/auto-host.h:2533:/* #undef PREFIX_INCLUDE_DIR *
```