Index: /applications/editors/josm/plugins/flatlaf/build.xml
===================================================================
--- /applications/editors/josm/plugins/flatlaf/build.xml	(revision 35699)
+++ /applications/editors/josm/plugins/flatlaf/build.xml	(revision 35700)
@@ -16,3 +16,8 @@
     <target name="pre-compile" depends="fetch_dependencies"/>
 
+    <target name="additional-manifest">
+        <manifest file="MANIFEST" mode="update">
+            <attribute name="Multi-Release" value="true"/>
+        </manifest>
+    </target>
 </project>