seems there was a setter missing in <script>

src/main/org/apache/tools/ant/taskdefs/optional/Script.java

@@ -130,4 +130,15 @@ public class Script extends Task {
     public void setSetBeans(boolean setBeans) {
         helper.setSetBeans(setBeans);
     }
+
+    /**
+     * Set the encoding of the script from an external file ; optional.
+     *
+     * @param encoding the encoding of the file containing the script source.
+     * @since Ant 1.10.2
+     */
+    public void setEncoding(String encoding) {
+        helper.setEncoding(encoding);
+    }
+
 }