src/Pure/Admin/isabelle_cronjob.scala

           options = "-m32 -M8" +
             " -e ISABELLE_GHC=ghc -e ISABELLE_MLTON=mlton -e ISABELLE_OCAML=ocaml" +
             " -e ISABELLE_OCAMLC=ocamlc -e ISABELLE_SMLNJ=/mnt/nfsbroy/home/smlnj/bin/sml",
           args = "-a",
           detect = Build_Log.Prop.build_tags.undefined,
-          active = false),
+          history_base = "2c0f24e927dd"),
         Remote_Build("Mac OS X 10.9 Mavericks, quick_and_dirty", "macbroy2",
           options = "-m32 -M8 -t quick_and_dirty", args = "-a -o quick_and_dirty",
           detect = Build_Log.Prop.build_tags + " = " + SQL.string("quick_and_dirty"),
-          active = false),
+          history_base = "2c0f24e927dd"),
         Remote_Build("Mac OS X 10.9 Mavericks, skip_proofs", "macbroy2",
           options = "-m32 -M8 -t skip_proofs", args = "-a -o skip_proofs",
           detect = Build_Log.Prop.build_tags + " = " + SQL.string("skip_proofs"),
-          active = false)),
+          history_base = "2c0f24e927dd")),
       List(
         Remote_Build("Mac OS X 10.12 Sierra", "macbroy30", options = "-m32 -M2", args = "-a",
           detect = Build_Log.Prop.build_start + " > date '2017-03-03'")),
       List(Remote_Build("Mac OS X 10.10 Yosemite", "macbroy31", options = "-m32 -M2", args = "-a")),
       List(