--- a/stx_libjava.st	Thu Mar 07 17:27:03 2019 +0100
+++ b/stx_libjava.st	Thu Mar 07 17:33:35 2019 +0100
@@ -163,6 +163,18 @@
     )
 !
 
+nonMandatorySubProjects
+    "list subprojects which can be ignored if the folder has been removed.
+     Make will give a warning, but proceed.
+     Should be a subset of what is returned by #subProjects"
+
+    ^ #(
+        #'stx:libjava/experiments'
+    )
+
+    "Created: / 07-03-2019 / 17:31:27 / Claus Gittinger"
+!
+
 referencedPreRequisites
     "list packages which are a prerequisite, because they contain
      classes which are referenced by my classes.