Index: openacs-4/etc/config.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/etc/config.tcl,v
diff -u -N -r1.48 -r1.49
--- openacs-4/etc/config.tcl	19 Sep 2008 08:38:05 -0000	1.48
+++ openacs-4/etc/config.tcl	27 Mar 2009 19:23:28 -0000	1.49
@@ -622,8 +622,11 @@
     ns_param   nssock             ${bindir}/nssock.so 
     ns_param   nslog              ${bindir}/nslog.so 
     ns_param   nssha1             ${bindir}/nssha1.so 
-    ns_param   nscache            ${bindir}/nscache.so 
-
+    # since aolserver version 4.5.1 built-in ns_cache, so we dont
+    # need to load the nscache module. 
+    if {[ns_info version] < 4.5.1} {
+          ns_param   nscache            ${bindir}/nscache.so 
+    }
     # openacs versions earlier than 5.x requires nsxml
 #    ns_param nsxml              ${bindir}/nsxml.so