Requiring Java7 breaks BWC as well.
diff --git a/changes.xml b/changes.xml
index 6d34883..2efc183 100644
--- a/changes.xml
+++ b/changes.xml
@@ -44,6 +44,8 @@
for LZMA and Snappy.
XZ for Java 1.6 or later is required for write support for LZMA.
Brotli dec 0.1.2 or later is required for Brotli support.
+ As a side effect the Compress Antlib now requires Java 7 at
+ runtime as this is required by Commons Compress 1.14.
</action>
<action type="add">
A new keepCompression flag can be used to keep the content
