experiment re  Bug 320191 -  [pde] Exporting an OT plug-in requires to have org.eclipse.objectteams.runtime in the ws
try to avoid repackaging/nesting of otre.jar, set OTRE classpath container directly to org.eclipse.objectteams.runtime.
diff --git a/plugins/org.eclipse.objectteams.runtime/build.properties b/plugins/org.eclipse.objectteams.runtime/build.properties
index 1546092..ba784f2 100644
--- a/plugins/org.eclipse.objectteams.runtime/build.properties
+++ b/plugins/org.eclipse.objectteams.runtime/build.properties
@@ -1,4 +1,7 @@
+source.. = src/
+output.. = bin/
 bin.includes = META-INF/,\
-               lib/otre.jar,\
+               .,\
                plugin.properties,\
                about.html
+javacProjectSettings = true