对MakeFile 不是很懂，麻烦看一下出了什么问题

Question

g++ -o spider -rdynamic -levent -lcrypt -ldl -pthread bloomfilter.o confparser.o crc32.o dso.o hashs.o md5.o qstring.o sha1.o socket.o spider.o threads.o url.o

dso.o: In function dso_load(char const*, char const*)':
dso.cpp:(.text+0x4d): undefined reference todlopen'
dso.cpp:(.text+0x5d): undefined reference to dlsym'
dso.cpp:(.text+0xc4): undefined reference todlerror'
dso.cpp:(.text+0x16f): undefined reference to dlerror'
url.o: In functionurlparser(void*)':
url.cpp:(.text+0xf4a): undefined reference to event_init'
url.cpp:(.text+0xf51): undefined reference toevdns_init'
url.cpp:(.text+0xf73): undefined reference to evdns_resolve_ipv4'
url.cpp:(.text+0xf78): undefined reference toevent_dispatch'
url.cpp:(.text+0xf80): undefined reference to event_base_free'
url.o: In functiondns_callback(int, char, int, int, void*, void*)':
url.cpp:(.text+0xfee): undefined reference to `event_loopexit'
collect2: ld returned 1 exit status

Answer 1

参数或函数未定义，或者是少包含了某个头文件