用EVC4编译ceramdrv.c,出现以下错误，什么原因？

--------------------Configuration: ceramdrv - Win32 (WCE x86) Debug--------------------
Linking...
corelibc.lib(pegwmain.obj) : error LNK2019: unresolved external symbol _WinMain referenced in function _WinMainCRTStartup
X86Dbg/ceramdrv.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.

ceramdrv.exe - 2 error(s), 0 warning(s)

注：单独编译上述文件无错误，但生成EXE文件就不行，请哪位大侠
指点小弟一下