请教

请教
我在AIX 5下编译C++程序,ld时报错
ld: 0711-317 ERROR: Undefined symbol: .std::ios_base::clear(int,bool)
ld: 0711-317 ERROR: Undefined symbol: Virtual table for class "__DynaCastDesc_si_public": first non-inline virtual function in "__Dy
naCastDesc_si_public" is not defined.
ld: 0711-317 ERROR: Undefined symbol: Virtual table for class "eti_cplusplus": first non-inline virtual function in "eti_cplusplus"
is not defined.
请问,如何解决?

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