Index: property.jam
===================================================================
--- property.jam	(revision 40459)
+++ property.jam	(working copy)
@@ -455,19 +455,28 @@
         local m = [ MATCH ^@(.+) : $(p:G=) ] ;
         if $(m)
         {
-            if ! [ MATCH ".*([.]).*" : $(m) ]
+            local v ;
+            if ! [ MATCH "^([^%]*)%([^%]+)$" : $(m) ]
             {
-                # This is unqualified rule name. The user might want
-                # to set flags on this rule name, and toolset.flag
-                # auto-qualifies the rule name. Need to do the same
-                # here so set flag setting work.
-                # We can arrange for toolset.flag to *not* auto-qualify
-                # the argument, but then two rules defined in two Jamfiles
-                # will conflict.
-                m = $(context-module).$(m) ;
+                if ! [ MATCH ".*([.]).*" : $(m) ]
+                {
+                    # This is unqualified rule name. The user might want
+                    # to set flags on this rule name, and toolset.flag
+                    # auto-qualifies the rule name. Need to do the same
+                    # here so set flag setting work.
+                    # We can arrange for toolset.flag to *not* auto-qualify
+                    # the argument, but then two rules defined in two Jamfiles
+                    # will conflict.
+                    m = $(context-module).$(m) ;
+                }
+                
+                v = [ indirect.make $(m) : $(context-module) ] ;
             }
+            else
+            { # rule is already in indirect format
+                v = $(m) ;
+            }
             
-            local v = [ indirect.make $(m) : $(context-module) ] ;
             v = @$(v) ;
             result += $(v:G=$(p:G)) ;
         }