upping pre-req to the new dtp-sdk_1.6M4b.zip (especially since previous one is gone!).
diff --git a/releng/maps/dependencies.properties b/releng/maps/dependencies.properties
index ee62e47..9901dca 100644
--- a/releng/maps/dependencies.properties
+++ b/releng/maps/dependencies.properties
@@ -148,7 +148,7 @@
 # groupID : dtp
 
 dtp.mirror.prefixuri = /datatools/downloads/1.6
-dtp.file = dtp-sdk_1.6M4.zip
+dtp.file = dtp-sdk_1.6M4b.zip
 dtp.name = DTP sdk v1.6
 
 dtp.url  = http://download.eclipse.org${dtp.mirror.prefixuri}