diff -r db1bc2732554 -r abc34a149690 src/Pure/System/isabelle_tool.scala
--- a/src/Pure/System/isabelle_tool.scala	Fri Nov 11 11:30:31 2016 +0100
+++ b/src/Pure/System/isabelle_tool.scala	Fri Nov 11 11:41:14 2016 +0100
@@ -101,7 +101,6 @@
     List(
       Build.isabelle_tool,
       Build_Doc.isabelle_tool,
-      Build_PolyML.isabelle_tool,
       Build_Stats.isabelle_tool,
       Check_Sources.isabelle_tool,
       Doc.isabelle_tool,