diff --git a/admin/automerge b/admin/automerge
new file mode 100755
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--- /dev/null
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@@ -0,0 +1,196 @@
+#!/bin/bash
+### automerge - merge the Emacs release branch to master
+
+## Copyright (C) 2018 Free Software Foundation, Inc.
+
+## Author: Glenn Morris <rgm@gnu.org>
+
+## This file is part of GNU Emacs.
+
+## GNU Emacs is free software: you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+
+## GNU Emacs is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+
+## You should have received a copy of the GNU General Public License
+## along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
+
+### Commentary:
+
+## Automatically merge the Emacs release branch to master.
+## No warranty, etc.
+
+die ()                 # write error to stderr and exit
+{
+    [ $# -gt 0 ] && echo "$PN: $@" >&2
+    exit 1
+}
+
+PN=${0##*/}                     # basename of script
+PD=${0%/*}
+
+[ "$PD" = "$0" ] && PD=.        # if PATH includes PWD
+
+## This should be the admin directory.
+cd $PD
+cd ../
+[ -d admin ] || die "Could not locate admin directory"
+
+[ -e .git ] || die "No .git"
+
+usage ()
+{
+    cat 1>&2 <<EOF
+Usage: ${PN} [-b] [-e emacs] [-n nmin] [-p] [-t] [-- make-flags]
+Merge the Emacs release branch to master.
+Passes any non-option args to make (eg -- -j2).
+Options:
+-e: Emacs executable to use for the initial merge (default $emacs)
+-n: Minimum number of commits to try merging (default $nmin)
+-b: try to build after merging
+-t: try to check after building
+-p: if merge, build, check all succeed, push when finished (caution!)
+EOF
+    exit 1
+}
+
+
+## Defaults.
+
+emacs=emacs
+nmin=10
+build=
+test=
+push=
+quiet=
+
+while getopts ":hbe:n:pqt" option ; do
+    case $option in
+        (h) usage ;;
+
+        (b) build=1 ;;
+
+        (e) emacs=$OPTARG ;;
+
+        (n) nmin=$OPTARG ;;
+
+        (p) push=1 ;;
+
+        (q) quiet=1 ;;
+
+        (t) test=1 ;;
+
+        (\?) die "Bad option -$OPTARG" ;;
+
+        (:) die "Option -$OPTARG requires an argument" ;;
+
+        (*) die "getopts error" ;;
+    esac
+done
+shift $(( --OPTIND ))
+OPTIND=1
+
+
+## Does not work 100% because a lot of Emacs batch output comes on
+## stderr (?).
+[ "$quiet" ] && exec 1> /dev/null
+
+
+[ "$push" ] && test=1
+[ "$test" ] && build=1
+
+
+tempfile=/tmp/$PN.$$
+
+trap "rm -f $tempfile 2> /dev/null" EXIT
+
+
+[ -e Makefile ] && [ "$build" ] && {
+    echo "Cleaning..."
+    make maintainer-clean >& /dev/null
+}
+
+
+echo "Merging..."
+
+if $emacs --batch -Q -l ./admin/gitmerge.el \
+       --eval "(setq gitmerge-minimum-missing $nmin)" -f gitmerge \
+       >| $tempfile 2>&1; then
+    echo "merged ok"
+
+else
+    grep -qE "Nothing to merge|Number of missing commits" $tempfile && {
+        echo "Fewer than $nmin commits to merge"
+        exit 0
+    }
+
+    cat "$tempfile" 1>&2
+
+    die "merge error"
+fi
+
+
+[ "$build" ] || exit 0
+
+
+echo "Running autoreconf..."
+
+autoreconf -i -I m4 2>| $tempfile
+
+retval=$?
+
+## Annoyingly, autoreconf puts the "installing `./foo' messages on stderr.
+if [ "$quiet" ]; then
+    grep -v 'installing `\.' $tempfile 1>&2
+else
+    cat "$tempfile" 1>&2
+fi
+
+[ $retval -ne 0 ] && die "autoreconf error"
+
+
+echo "Running ./configure..."
+
+## Minimize required packages.
+./configure --without-x || die "configure error"
+
+
+echo "Building..."
+
+make "$@" || die "make error"
+
+echo "Build finished ok"
+
+
+[ "$test" ] || exit 0
+
+
+echo "Testing..."
+
+make "$@" check || die "check error"
+
+echo "Tests finished ok"
+
+
+[ "$push" ] || exit 0
+
+
+## In case someone else pushed while we were working.
+echo "Checking for remote changes..."
+git fetch || die "fetch error"
+## git >= 1.8.5 has "pull --rebase=preserve"
+git rebase --preserve-merges || die "rebase error"
+
+
+echo "Pushing..."
+git push || die "push error"
+
+
+exit 0
+
+### automerge ends here