请问下为什么我在本站下载的源代码，连接时出现下面的问题：
*** c:\documents and settings\kjcx\桌面\大赛\fushitong\mb95260\io_port\main.c(25) E4305L: Unresolved external symbol (_IO_PDR0)
*** c:\documents and settings\kjcx\桌面\大赛\fushitong\mb95260\io_port\main.c(25) E4305L: Unresolved external symbol (_IO_PDR0)
*** c:\documents and settings\kjcx\桌面\大赛\fushitong\mb95260\io_port\main.c(26) E4305L: Unresolved external symbol (_IO_DDR0)
*** c:\documents and settings\kjcx\桌面\大赛\fushitong\mb95260\io_port\main.c(26) E4305L: Unresolved external symbol (_IO_DDR0)
*** c:\documents and settings\kjcx\桌面\大赛\fushitong\mb95260\io_port\main.c(27) E4305L: Unresolved external symbol (_IO_PDR0)
*** c:\documents and settings\kjcx\桌面\大赛\fushitong\mb95260\io_port\main.c(27) E4305L: Unresolved external symbol (_IO_PDR0)
*** c:\documents and settings\kjcx\桌面\大赛\fushitong\mb95260\io_port\main.c(28) E4305L: Unresolved external symbol (_IO_AIDRL)
希望可以尽快解决
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