TYPO3 Core

Importing XML-data via CLI won't work in non-composer-environment with error:
PHP Parse error: syntax error, unexpected '(' in /var/www/virtual/domain.de/htdocs/typo3_src-11.5.24/vendor/composer/autoload_real.php on line 43

foreach ($filesToLoad as $fileIdentifier => $file) {
  ($requireFile)($fileIdentifier, $file);
}

I'm using TYPO3 11.5.24 on Debian stretch and php 8.0.17

btw, Why can't I import XML via backend? There is only a menu-entry "import from *.t3d" and using any xml-file ends in parsing error...