1. 1.7.x modules/system/system.module BACKDROP_REQUIRED
  2. 1.10.x core/modules/system/system.module BACKDROP_REQUIRED
  3. 1.8.x modules/system/system.module BACKDROP_REQUIRED
  4. 1.9.x modules/system/system.module BACKDROP_REQUIRED

Required option on forms and settings

File

modules/system/system.module, line 40
Configuration system that lets administrators modify the workings of the site.

Code

define('BACKDROP_REQUIRED', 2)