[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 #3 from Sam James <sjames at gcc dot gnu.org> ---
(In reply to Sam James from comment #2)
> ```
> /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 *
> ```

if test x$with_sysroot = x && test x$host = x$target \
   && test "$prefix" != "/usr" && test "x$prefix" != "x$local_prefix" \
   && test "$prefix" != "NONE"; then
  AC_DEFINE_UNQUOTED(PREFIX_INCLUDE_DIR, "$prefix/include",
[Define to PREFIX/include if cpp should also search that directory.])
fi