Hello, There seem to be a critical bugs hiding behind the way the install profiles are implemented. At the very least, there seem to be a gross inconsistency in the documentation. I could have fixed the api documentation myself, except that I am not sure what is the 'normal' behavior. When creating an install profile, one runs against such errors: "Fatal error: Call to undefined function xxx()" http://www.google.com/search?q=site%3Adrupal.org+profile+install+Fatal+error... This happens when one includes a few specific modules in hook_profile_modules(), including book.module: http://drupal.org/node/164458#comment-643884 The api says that all functions are loaded when running hook_install(): http://api.drupal.org/api/function/hook_install "Note that since this function is called from a full bootstrap, all functions (including those in modules enabled by the current page request) are available when this hook is called. Use cases could be displaying a user message, or calling a module function necessary for initial setup, etc." But the profile documentation implies the contrary: http://drupal.org/node/67921 the modules (including core required modules and their functions) are NOT yet included when running hook_profile_modules() (which calls hook_install()). The modules are included only at a later stage, hook_profile_final(). A similar problem occurred with forum.module, until a certain function call was moved to hook_enable(): http://drupal.org/node/157519 This begs the question: what is it ok to include in hook_install()? Is hook_install() only for the DB schema, or can heavier lifting be done using any function call? If this cannot be fixed for D6, some warning should be included in the documentation, especially here: http://drupal.org/node/67921 . I didn't do so myself because I am uncertain about all the above. Blessings, Augustin.