uccos移植LWIP报错

仿照LWIP扩展实验7 在UCCOS上移植LWIP 老是报错··
Build target 'UCOSII'
compiling sys_arch.c...
..LWIParchsys_arch.c(184): warning:  #223-D: function "OSEventNameSet" declared implicitly
  OSEventNameSet(sem,"LWIP Sem",&err);
..LWIParchsys_arch.c: 1 warning, 0 errors
linking...
..OBJUCOSII.axf: Error: L6218E: Undefined symbol OSEventNameSet (referred from sys_arch.o).
Not enough information to list image symbols.
Finished: 1 information, 0 warning and 1 error messages.
"..OBJUCOSII.axf" - 1 Error(s), 1 Warning(s).
Target not created
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