Index: Linux-PAM-0.99.3.0/configure.in
===================================================================
--- Linux-PAM-0.99.3.0.orig/configure.in
+++ Linux-PAM-0.99.3.0/configure.in
@@ -175,9 +175,15 @@ dnl
 dnl options and defaults
 dnl
 
-AM_PATH_LIBPRELUDE([0.9.0])
-if test "$LIBPRELUDE_CONFIG" != "no" ; then
-  LIBPRELUDE_CFLAGS="$LIBPRELUDE_CFLAGS -DPRELUDE=1"
+AC_ARG_ENABLE([prelude],
+    AS_HELP_STRING([--disable-prelude],
+        [Disable building of prelude support (default: check)]))
+
+if test "x$enable_prelude" != "xno"; then
+  AM_PATH_LIBPRELUDE([0.9.0])
+  if test "$LIBPRELUDE_CONFIG" != "no" ; then
+    LIBPRELUDE_CFLAGS="$LIBPRELUDE_CFLAGS -DPRELUDE=1"
+  fi
 fi
 
 dnl lots of debugging information goes to /var/run/pam-debug.log