"Variable length array in structure won't be supported" build failure(s) — clang 13.0.0

The following code is not (and won't) supported by clang.
int returnAnInt(void) {
  return 42;
}

int main() {
  struct {
     char buf[returnAnIt()];
  } r;
}
PackageVersionSupposed error messageFull log Bug report
ipmctl 02.00.00.3885+ds-1lnx_adapter_passthrough.c:192:5: fatal error: fields must have a constant size: 'variable length array in structure' extension will never be supported Log
libdc1394 2.2.6-4)capture.c:324:9: error: fields must have a constant size: 'variable length array in structure' extension will never be supported Log
rng-tools-debian 2.3rngd_linux.c:189:17: error: fields must have a constant size: 'variable length array in structure' extension will never be supported Log
rng-tools5 5-4rngd_linux.c:126:17: error: fields must have a constant size: 'variable length array in structure' extension will never be supported Log
unicap 0.9.12+repack20150328.0.git2c600ae-3dcam_juju_capture.c:286:12: error: fields must have a constant size: 'variable length array in structure' extension will never be supported Log

5 errors