9 uses of REQUIREMENT_OK

color_requirements in modules/color/color.install
Implements hook_requirements().
drupal_requirements_severity in includes/install.inc
Extracts the highest severity from the requirements array.
file_requirements in modules/file/file.install
Implements hook_requirements().
image_requirements in modules/image/image.install
Implements hook_requirements() to check the PHP GD Library.
openid_requirements in modules/openid/openid.install
Implements hook_requirements().
system_requirements in modules/system/system.install
Implements hook_requirements().
unicode_requirements in includes/unicode.inc
Returns Unicode library status and errors.
update_prepare_d7_bootstrap in includes/update.inc
Performs extra steps required to bootstrap when using a Drupal 6 database.
_system_check_db_utf8mb4_requirements in modules/system/system.install
Checks whether the requirements for multi-byte UTF-8 support are met.

Buggy or inaccurate documentation? Please file an issue. Need support? Need help programming? Connect with the Drupal community.