--- D:/password_change/password_change.install	Mon Dec 14 06:38:04 2009
+++ D:/password_change/password_change.install.mod	Sat Oct 23 10:31:44 2010
@@ -6,6 +6,15 @@
  * Install and uninstall schema and functions for the password_change module.
  */
 
+// based on phpass.module
+function password_change_install() {
+  // detect presence of phpass (pass hash method set as 'phpass')
+  if (module_exists("phpass") && variable_get('user_hash_method', 'phpass') == 'phpass') {
+    // report error if passwordhash is missing through a phpass.module function
+    _phpass_is_passwordhash_php_missing();
+  }
+}
+
 function password_change_uninstall() {
   variable_del('password_change_all');
 }