# This shell has a builtin print -r that does the trick.      echo='print -r'    elif (test -f /bin/ksh || test -f /bin/ksh$ac_exeext) &&	 test "X$CONFIG_SHELL" != X/bin/ksh; then      # If we have ksh, try running configure again with it.      ORIGINAL_CONFIG_SHELL=${CONFIG_SHELL-/bin/sh}      export ORIGINAL_CONFIG_SHELL      CONFIG_SHELL=/bin/ksh      export CONFIG_SHELL      exec $CONFIG_SHELL "[$]0" --no-reexec ${1+"[$]@"}    else      # Try using printf.      echo='printf %s\n'      if test "X`($echo '\t') 2>/dev/null`" = 'X\t' &&	 echo_testing_string=`($echo "$echo_test_string") 2>/dev/null` &&	 test "X$echo_testing_string" = "X$echo_test_string"; then	# Cool, printf works	:      elif echo_testing_string=`($ORIGINAL_CONFIG_SHELL "[$]0" --fallback-echo '\t') 2>/dev/null` &&	   test "X$echo_testing_string" = 'X\t' &&	   echo_testing_string=`($ORIGINAL_CONFIG_SHELL "[$]0" --fallback-echo "$echo_test_string") 2>/dev/null` &&	   test "X$echo_testing_string" = "X$echo_test_string"; then	CONFIG_SHELL=$ORIGINAL_CONFIG_SHELL	export CONFIG_SHELL	SHELL="$CONFIG_SHELL"	export SHELL	echo="$CONFIG_SHELL [$]0 --fallback-echo"      elif echo_testing_string=`($CONFIG_SHELL "[$]0" --fallback-echo '\t') 2>/dev/null` &&	   test "X$echo_testing_string" = 'X\t' &&	   echo_testing_string=`($CONFIG_SHELL "[$]0" --fallback-echo "$echo_test_string") 2>/dev/null` &&	   test "X$echo_testing_string" = "X$echo_test_string"; then	echo="$CONFIG_SHELL [$]0 --fallback-echo"      else	# maybe with a smaller string...	prev=:	for cmd in 'echo test' 'sed 2q "[$]0"' 'sed 10q "[$]0"' 'sed 20q "[$]0"' 'sed 50q "[$]0"'; do	  if (test "X$echo_test_string" = "X`eval $cmd`") 2>/dev/null	  then	    break	  fi	  prev="$cmd"	done	if test "$prev" != 'sed 50q "[$]0"'; then	  echo_test_string=`eval $prev`	  export echo_test_string	  exec ${ORIGINAL_CONFIG_SHELL-${CONFIG_SHELL-/bin/sh}} "[$]0" ${1+"[$]@"}	else	  # Oops.  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