[Buildroot] How to control host gcc version?

[Grant Edwards <grant.b.edwards@gmail.com>]

I'm trying to build a root filesystem using a vendor-supplied copy of
buildroot 2020.02.07.

Unfortunately, some of the packages that buildroot wants to build for
the host (e.g. m4) are so old they won't compile with my host's
version of gcc (13.3).  [I've got m4 installed on the host, but
buildroot still wants to build its own.]

I can install older versions of gcc, but I can't figure out how to
tell buildroot what host toolchain to use. There must be an option for
that, but I've been searching through the manual and haven't found it.

How do I tell buildroot what host gcc to use (e.g. 'gcc-11' instead of
'gcc')?

--
Grant

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