AC_OUTPUT

所以，经过修改后，我们的configure.in文件是：
# -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.

AC_PREREQ([2.69])
AC_INIT([beep], [0.1], [reaper888@yeah.net])
AC_CONFIG_SRCDIR([hello.c])
AC_CONFIG_HEADERS([config.h])
AM_INIT_AUTOMAKE
# Checks for programs.
AC_PROG_CC

# Checks for libraries.

# Checks for header files.

# Checks for typedefs, structures, and compiler characteristics.

# Checks for library functions.

AC_CONFIG_FILES([Makefile])
AC_OUTPUT

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