Index: openacs-4/packages/acs-tcl/tcl/install-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-tcl/tcl/install-procs.tcl,v
diff -u -r1.23 -r1.24
--- openacs-4/packages/acs-tcl/tcl/install-procs.tcl	15 Nov 2008 13:21:10 -0000	1.23
+++ openacs-4/packages/acs-tcl/tcl/install-procs.tcl	15 Nov 2008 17:13:03 -0000	1.24
@@ -96,6 +96,11 @@
     # XML installation files only support installation of local packages, as they're meant
     # to provide a means for installing tarball releases.
 
+    apm_get_installed_versions -array installed_versions
+    if { [info exists installed_versions($package_key)] } {
+        return
+    }
+
     apm_get_package_repository -array local_packages
     array set result [apm_dependency_check_new \
                       -repository_array local_packages \