Index: openacs-4/packages/acs-bootstrap-installer/tcl/00-proc-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-bootstrap-installer/tcl/00-proc-procs.tcl,v
diff -u -r1.66.2.10 -r1.66.2.11
--- openacs-4/packages/acs-bootstrap-installer/tcl/00-proc-procs.tcl	24 Jul 2020 11:50:30 -0000	1.66.2.10
+++ openacs-4/packages/acs-bootstrap-installer/tcl/00-proc-procs.tcl	12 Aug 2020 13:31:19 -0000	1.66.2.11
@@ -178,6 +178,14 @@
         }
     }
 
+    # Callback hooks and callback implementations are treated as
+    # private: rationale is they never get called by other packages
+    # directly.
+    if {$callback ne ""} {
+        set public_p 0
+        set private_p 1
+    }
+
     if { $public_p && $private_p } {
         return -code error "Mutually exclusive switches -public and -private passed to ad_proc"
     }