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diff --git a/t/backcompat2.sh b/t/backcompat2.sh
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+++ b/t/backcompat2.sh
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+#! /bin/sh
+# Copyright (C) 2010-2017 Free Software Foundation, Inc.
+#
+# This program 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 2, or (at your option)
+# any later version.
+#
+# This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
+
+# Backward-compatibility test: check that AM_INIT_AUTOMAKE with two or
+# three arguments does AC_DEFINE the symbols PACKAGE and VERSION iff the
+# third argument is empty or non-existent.
+
+am_create_testdir=empty
+. test-init.sh
+
+# A trick to make the test run muuuch faster, by avoiding repeated
+# runs of aclocal (one order of magnitude improvement in speed!).
+echo 'AC_INIT(x,0) AM_INIT_AUTOMAKE' > configure.ac
+$ACLOCAL
+rm -rf configure.ac autom4te.*
+
+touch install-sh missing
+
+cat > config.h.in <<'END'
+#undef PACKAGE
+#undef VERSION
+END
+
+for am_arg3 in ':' 'false' '#' ' '; do
+ unindent > configure.ac <<END
+ AC_INIT
+ AC_CONFIG_HEADERS([config.h])
+ AM_INIT_AUTOMAKE([pkgname], [pkgversion], [$am_arg3])
+ AC_OUTPUT
+END
+ cat configure.ac # For debugging.
+ $AUTOCONF
+ ./configure
+ cat config.h # For debugging.
+ # The non-empty third argument should prevent PACKAGE and VERSION
+ # from being AC_DEFINE'd.
+ $EGREP 'pkg(name|version)' config.h && exit 1
+ # This is required because even relatively-recent versions of the
+ # BSD shell wrongly exit when the 'errexit' shell flag is active if
+ # the last command of a compound statement fails, even if it should
+ # be protected by the use of "&&".
+ :
+done
+
+for am_extra_args in '' ',' ', []'; do
+ unindent > configure.ac <<END
+ AC_INIT
+ AC_CONFIG_HEADERS([config.h])
+ AM_INIT_AUTOMAKE([pkgname], [pkgversion]$am_extra_args)
+ AC_OUTPUT
+END
+ cat configure.ac # For debugging.
+ $AUTOCONF
+ ./configure
+ cat config.h # For debugging.
+ grep '^ *# *define *PACKAGE *"pkgname" *$' config.h
+ grep '^ *# *define *VERSION *"pkgversion" *$' config.h
+done
+
+: