路由软件 zebra-0.95a 在linux下面编译出现问题的解决(error: dereferencing pointer to incomplete type)

感谢：http://siwind.iteye.com/blog/1160830,谢谢！

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1.问题现象  
解压缩zebra-0.95a压缩包，编译，出现问题： 
./configure 
make 

后出现： 

 rtadv.c: In function ‘rtadv_recv_packet’:
 rtadv.c:123: error: dereferencing pointer to incomplete type
 rtadv.c:124: error: dereferencing pointer to incomplete type
 rtadv.c:124: error: dereferencing pointer to incomplete type
 rtadv.c:130: warning: dereferencing type-punned pointer will break strict-aliasing rules
 rtadv.c: In function ‘rtadv_send_packet’:
 rtadv.c:149: error: invalid application of ‘sizeof’ to incomplete type ‘struct in6_pktinfo’
 rtadv.c:194: warning: operation on ‘node’ may be undefined
 rtadv.c:268: error: dereferencing pointer to incomplete type
 rtadv.c:269: error: dereferencing pointer

2.解决  
打开zebra-0.95a/lib/zebra.h文件， 
定位到103行，添加如下内容，即可解决。 

#ifdef GNU_LINUX 
#define  __USE_GNU 
#endif  
========================= 

 #ifdef HAVE_SYS_SOCKIO_H
 #include <sys/sockio.h>
 #endif /* HAVE_SYS_SOCKIO_H */

 /** Added ***/
 #ifdef GNU_LINUX
 #define  __USE_GNU
 #endif
 /**   end added **/

 #ifdef HAVE_NETINET_IN_H
 #include <netinet/in.h>
 #endif /* HAVE_NETINET_IN_H */
 #include <netinet/in_systm.h>
 #include <netinet/ip.h>
 #include <netinet/tcp.h>

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