we don't want to delete existing maps, but consistently create the maps/ directory!
diff --git a/releng/build-scripts/build/OTDT-Build/customTargets.xml b/releng/build-scripts/build/OTDT-Build/customTargets.xml
index 41fbf9e..160c62a 100644
--- a/releng/build-scripts/build/OTDT-Build/customTargets.xml
+++ b/releng/build-scripts/build/OTDT-Build/customTargets.xml
@@ -44,6 +44,7 @@
 		-->
 		<property name="svn.map.url" value="${svn.repository.url}/${mapVersionTag}/${pathToMapFile}/${mapFileName}" />
 
+		<mkdir dir="${buildDirectory}/maps"/>
 		<svn command="export" url="${svn.map.url}" dest="${buildDirectory}/maps/${mapFileName}" />
 	</target>