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--- a/etc/NEWS
+++ b/etc/NEWS
@@ -25,6 +25,15 @@ otherwise leave it unmarked.
* Installation Changes in Emacs 25.2
++++
+** New configure option ‘--disable-build-details’ attempts to build an
+Emacs that is more likely to be reproducible; that is, if you build
+and install Emacs twice, the second Emacs is a copy of the first.
+Deterministic builds omit the build date from the output of the
+emacs-version and erc-cmd-SV functions, and the leave the following
+variables nil: emacs-build-system, emacs-build-time,
+erc-emacs-build-time.
+
* Startup Changes in Emacs 25.2