--- javamail-JAVAMAIL-1_5_2/build.xml	2014-05-03 00:52:03.000000000 +0200
+++ javamail-JAVAMAIL-1_5_2/build.xml	2019-01-21 12:35:28.859613463 +0100
@@ -573,6 +573,7 @@
             author="false"
             version="false"
             use="true"
+            source="${javac.source}"
             overview="${release.dir}/javadoc/overview.html"
             windowtitle="JavaMail API documentation"
             doctitle="JavaMail API documentation">