install_verify_requirements

install_verify_requirements(&$install_state)

function install_verify_requirements(&$install_state) {
  // Check the installation requirements for Drupal and this profile.
  $requirements = install_check_requirements($install_state);

  // Verify existence of all required modules.
  $requirements += drupal_verify_profile($install_state);

  return install_display_requirements($install_state, $requirements);
}