Attached is a patch that fixed my immediate problem, the ability to build packages using ant that remain compatible with Java 1.6.
Bdale
From 07a73a1b2f10255ec9535f66db82a192780611b7 Mon Sep 17 00:00:00 2001
From: Bdale Garbee <bd...@gag.com>
Date: Mon, 20 Aug 2018 20:49:42 -0600
Subject: [PATCH] see if we can make ant stop breaking Java 1.6 compatibility
for no reason
---
debian/changelog | 6 ++++++
debian/patches/0013-auto-adjust-target.patch | 4 ++--
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/debian/changelog b/debian/changelog
index 582a2fd..fbcd80d 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+ant (1.10.5-1.bdale.1) UNRELEASED; urgency=medium
+
+ * adjust the version warping patch to preserve Java 1.6 compatibility
+
+ -- Bdale Garbee <bd...@gag.com> Mon, 20 Aug 2018 20:49:25 -0600
+
ant (1.10.5-1) unstable; urgency=medium
* Team upload.
diff --git a/debian/patches/0013-auto-adjust-target.patch b/debian/patches/0013-auto-adjust-target.patch
index 28dc59f..e8ca50c 100644
--- a/debian/patches/0013-auto-adjust-target.patch
+++ b/debian/patches/0013-auto-adjust-target.patch
@@ -67,10 +67,10 @@ Forwarded: no
+class LanguageLevel {
+
+ /** The minimum language level supported by the current javac */
-+ private static final String MIN_LEVEL = "7";
++ private static final String MIN_LEVEL = "6";
+
+ /** The list of language levels no longer supported by the current javac */
-+ private static final List<String> UNSUPPORTED_LEVELS = Arrays.asList(new String[]{"1.1", "1.2", "1.3", "1.4", "1.5", "5", "1.6", "6"});
++ private static final List<String> UNSUPPORTED_LEVELS = Arrays.asList(new String[]{"1.1", "1.2", "1.3", "1.4", "1.5", "5"});
+
+ /** Detect if a Debian build is in process */
+ static boolean isDebianBuild() {
--
2.18.0
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