Index: applications/editors/josm/plugins/build-common.xml
===================================================================
--- applications/editors/josm/plugins/build-common.xml	(revision 29007)
+++ applications/editors/josm/plugins/build-common.xml	(revision 29435)
@@ -117,4 +117,5 @@
             <param name="propery.value" value="${plugin.stage}"/>
         </antcall>
+        <antcall target="additional-manifest" />
         <jar destfile="${plugin.jar}" basedir="${plugin.build.dir}" manifest="MANIFEST">
             <zipgroupfileset dir="${plugin.lib.dir}" includes="*.jar" erroronmissingdir="no"/>
@@ -130,4 +131,7 @@
             <attribute name="${manifest.attribute}" value="${propery.value}" />
         </manifest>
+    </target>
+    <!-- target to add additional entries, empty in commons -->
+    <target name="additional-manifest">
     </target>
     <target name="check-manifest-attribute">