我的头文件已将加到form1.ui.h中了（里面有如下的自定义函数和变量），但编译时仍出现下面的问题，不知问题出在哪，请帮我分析一下，谢谢！
form1.cpp:(.text+0xb7): undefined reference to `send_signal(int, char*)'
.obj/form1.o: In function `Form1::xinhao77()':
form1.cpp:(.text+0x1b7): undefined reference to `send_signal(int, char*)'
.obj/form1.o: In function `Form1::xinhaoEF()':
form1.cpp:(.text+0x1e7): undefined reference to `send_signal(int, char*)'
.obj/form1.o: In function `Form1::qlianjie()':
form1.cpp:(.text+0xb1c): undefined reference to `ini_client(sockaddr_in)'
form1.cpp:(.text+0xb29): undefined reference to `setsocket(int)'
form1.cpp:(.text+0xb62): undefined reference to `kunbang(int, sockaddr_in)'
form1.cpp:(.text+0xc35): undefined reference to `ini_server(sockaddr_in)'
form1.cpp:(.text+0xc66): undefined reference to `lianjie(int, sockaddr_in)'
collect2: ld 返回 1
make: *** [unnamed] 错误 1
