[Bug 294900] Errors during buildworld: C++20 extension

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=294900

--- Comment #8 from Benjamin Jacobs <freebsd@dev.thsi.be> ---
mk/bsd.compiler.mk contains this:
if !defined(${X_}COMPILER_RESOURCE_DIR)
${X_}COMPILER_RESOURCE_DIR!=    ${${cc}:N${CCACHE_BIN}} -print-resource-dir
2>/dev/null || echo unknown
.endif

this is used by mk/bsd.sys.mk in your case ("external compiler")

So it think you need to rebuild cccache for it the 21 version number.

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