unresolved external symbol——链接错误！在线等，急！

Compiling...
test.c
Linking...
test.obj : error LNK2001: unresolved external symbol _ECRYPT_process_packet
test.obj : error LNK2001: unresolved external symbol _ECRYPT_keysetup
test.obj : error LNK2001: unresolved external symbol _ECRYPT_init
Debug/test.exe : fatal error LNK1120: 3 unresolved externals
Error executing link.exe.test.exe - 4 error(s), 0 warning(s)
在vc里面调试c程序，提示这样得错误怎么处理啊？救命啊，谢谢大家啊