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diff --git a/t/cond15.sh b/t/cond15.sh
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+#! /bin/sh
+# Copyright (C) 2001-2017 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/>.
+
+# Regression test for conditionally defined overriding of automatic rules.
+
+. test-init.sh
+
+cat >> configure.ac << 'END'
+AC_PROG_CC
+AM_CONDITIONAL([COND1], [true])
+AM_CONDITIONAL([COND2], [true])
+END
+
+cat > Makefile.am << 'END'
+if COND1
+if COND2
+bin_SCRIPTS = helldl
+helldl$(EXEEXT):
+ rm -f $@
+ echo '#! /bin/sh' > $@
+ echo '-dlopen is unsupported' >> $@
+ chmod +x $@
+endif
+else
+if COND2
+else
+bin_SCRIPTS = helldl
+helldl$(EXEEXT):
+ rm -f $@
+ echo '#! /bin/sh' > $@
+ echo '-dlopen is unsupported' >> $@
+ chmod +x $@
+endif
+endif
+
+bin_PROGRAMS = helldl
+END
+
+$ACLOCAL
+$AUTOMAKE
+
+$FGREP helldl Makefile.in # For debugging.
+num1=$($FGREP -c 'helldl$(EXEEXT):' Makefile.in)
+num2=$($FGREP -c '@COND1_FALSE@@COND2_TRUE@helldl$(EXEEXT):' Makefile.in)
+test $num1 -eq 4
+test $num2 -eq 1
+
+: