diff --git a/build.xml b/build.xml
index c63e1d4cb..1eeee1c9c 100644
--- a/build.xml
+++ b/build.xml
@@ -743,7 +743,7 @@
               <include name="${executable}.xml" />
           </fileset>
 
-          <fileset dir="${external.dir}">
+          <fileset dir="${external.dir}" erroronmissingdir="false">
               <include name="*/${executable}.xml" />
           </fileset>