debian/changelog

+proguard (6.0.3-2) unstable; urgency=medium
+
+  * Team upload.
+  * Restored the compatibility with Java 8
+
+ -- Emmanuel Bourg <ebourg@apache.org>  Sun, 07 Jul 2019 21:54:52 +0200
+
 proguard (6.0.3-1) unstable; urgency=medium
 
   * Team upload.

debian/patches/04-java8-compatibility.patch

+Description: Preserves the backward compatibility with Java 8
+Author: Emmanuel Bourg <ebourg@apache.org>
+Forwarded: not-needed
+--- a/buildscripts/functions.sh
++++ b/buildscripts/functions.sh
+@@ -17,7 +17,7 @@
+   # Compile java source files.
+   echo "Compiling $(basename $PWD) ($1)..."
+   mkdir -p "$OUT" && \
+-  javac -nowarn -Xlint:none -sourcepath "$SRC" -d "$OUT" \
++  javac -nowarn -Xlint:none --release 8 -sourcepath "$SRC" -d "$OUT" \
+     "$SRC"/${1//.//}.java 2>&1 \
+     | sed -e 's|^|  |' || return 1
+ 

debian/patches/series

 01-fix-usage.patch
 02-build-classpath.patch
 03-disable-wtk-plugin.patch
+04-java8-compatibility.patch