color_requirements in drupal-7.x/modules/color/color.install

Implements hook_requirements().

drupal_requirements_severity in drupal-7.x/includes/install.inc

Extracts the highest severity from the requirements array.

file_requirements in drupal-7.x/modules/file/file.install

Implements hook_requirements().

image_requirements in drupal-7.x/modules/image/image.install

Implements hook_requirements() to check the PHP GD Library.

openid_requirements in drupal-7.x/modules/openid/openid.install

Implements hook_requirements().

... See full list