+m4_divert_push([PREPARE_TESTS])dnl
+# Reduce influence from the toplevel "make" invocation on test cases.
+AS_UNSET([MAKEFLAGS])
+AS_UNSET([MAKELEVEL])
+AS_UNSET([MFLAGS])
+m4_divert_pop([PREPARE_TESTS])
+
+m4_define([TEST_CONFIGURE_AC], [AT_KEYWORDS([autoconf m4])dnl
+AT_DATA([configure.ac],
+[[AC_INIT([test], [0])
+]$1[
+AC_OUTPUT
+]])
+cp "$srcdir/install-sh" \
+ "$srcdir/depcomp" \
+ "$srcdir/missing" \
+ "$srcdir/config.sub" \
+ .
+# Simplified config.guess script avoids some spurious testcase failures
+# when using heirloom-sh on GNU/Linux.
+config_guess=`"$srcdir/config.guess"`
+cat >config.guess <<EOF
+#!/bin/sh
+cat <<'GUESS_EOF'
+$config_guess
+GUESS_EOF
+EOF
+chmod +x config.guess
+])
+m4_define([TEST_AUTORECONF], [AT_KEYWORDS([autoconf])dnl
+AT_CHECK([autoreconf -I "$srcdir/m4"], [0], [], [stderr])])
+
+m4_define([TEST_CONFIGURE], [AT_KEYWORDS([configure])dnl
+AT_CHECK([export CC
+CONFIG_SHELL=$TEST_SHELL $TEST_SHELL ./configure CONFIG_SHELL=$TEST_SHELL $1],
+[0], [ignore])])
+