/**
  * @param PackageInterface $package
  * @return void
  */
 protected function buildPackageClassPathsForLegacyExtension(PackageInterface $package)
 {
     $this->packageClassesPaths[$package->getPackageKey()] = $package->getClassesPath();
     foreach ($package->getPackageReplacementKeys() as $packageToReplace => $_) {
         $this->packageClassesPaths[$packageToReplace] = $package->getClassesPath();
     }
 }