autotools总结
最后需要两项，（1）configure脚本，（2）Makefile.in
(1)configure = autoconf + (1.1)configure.ac + (1.2)aclocal.m4
(1.2)aclocal.m4 = aclocal + (1.1)configure.ac
(2)Makefile.in = automake + (2.1)Makefile.am
可选：
(1.1)configure.ac = autoscan + 手工修改
http://blog.csdn.net/scucj/article/details/6079052
http://www.ezloo.com/2008/04/gnu_autotools.html