diff -Nurp xdm-1.1.6/greeter/greet.c xdm-1.1.6-allowNullPasswd/greeter/greet.c
--- xdm-1.1.6/greeter/greet.c	2007-05-30 22:03:38.000000000 +0400
+++ xdm-1.1.6-allowNullPasswd/greeter/greet.c	2011-06-03 02:50:27.717616005 +0400
@@ -431,6 +431,7 @@ greet_user_rtn GreetUser(
     struct dlfuncs        *dlfuncs)
 {
     int i;
+    Arg		arglist[3];
 
 #ifdef GREET_LIB
 /*
@@ -489,6 +490,10 @@ greet_user_rtn GreetUser(
     openlog("xdm", LOG_ODELAY, LOG_AUTH);
 #endif
 
+    XtSetArg (arglist[0], XtNallowNullPasswd, (char *) &(greet->allow_null_passwd));
+    XtSetArg (arglist[1], XtNallowRootLogin, (char *) &(greet->allow_root_login));
+    XtGetValues (login, arglist, 2);
+
     for (;;) {
 #ifdef USE_PAM