有高手能解決嗎？ld: fatal: Symbol referencing errors. No output written to spine

kissjiejie

1.         (file /usr/lib/mysql/libmysqlclient_r.so value=0x35; file /usr/local/lib/libz.so value=0x44);
   
2.         /usr/lib/mysql/libmysqlclient_r.so definition taken
   
3. Undefined                       first referenced
   
4. symbol                             in file
   
5. gethostbyname                       ping.o  (symbol belongs to implicit dependency /usr/lib/libnsl.so.1)
   
6. h_errno                             ping.o  (symbol belongs to implicit dependency /usr/lib/libnsl.so.1)
   
7. ld: fatal: Symbol referencing errors. No output written to spine
   
8. collect2: ld returned 1 exit status
   
9. make: *** [spine] Error 1
   

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