Index: openacs-4/packages/acs-tcl/tcl/site-nodes-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-tcl/tcl/site-nodes-procs.tcl,v
diff -u -N -r1.93.2.10 -r1.93.2.11
--- openacs-4/packages/acs-tcl/tcl/site-nodes-procs.tcl	1 Dec 2015 09:24:26 -0000	1.93.2.10
+++ openacs-4/packages/acs-tcl/tcl/site-nodes-procs.tcl	8 Jul 2016 14:17:32 -0000	1.93.2.11
@@ -1531,7 +1531,7 @@
 
         # Turn on caching by registering the mixin (backward compatibility
         # for early XOTcl2-versions, probably not needed anymore).
-        if {"2.0.0" in [package versions nsf]} {
+        if {[package require nsf] >= "2.0.0"} {
             site_node object mixins add SiteNodeCache
         } else {
             site_node object mixin add SiteNodeCache