--- a/NEWS Thu Oct 07 23:41:06 2021 +0200
+++ b/NEWS Thu Oct 07 23:42:10 2021 +0200
@@ -427,6 +427,12 @@
* Update to OpenJDK 17: the current long-term support version of Java.
+* Perl is no longer required by Isabelle proper, and longer provided by
+specific Isabelle execution environments (Docker, Cygwin on Windows).
+Minor INCOMPATIBILITY, add-on applications involving perl need to
+provide it by different means. (Note that proper Isabelle systems
+programming works via Scala/Java, without perl, python, ruby etc.).
+
* Each Isabelle component may specify a Scala/Java jar module
declaratively via etc/build.props (file names are relative to the
component directory). E.g. see $ISABELLE_HOME/etc/build.props with