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Object file error

i have code called vector.cpp , is written by C++ , i want to buld this code on CCS5 but when i press build an error happens which in .obj file and this is the error 

"

undefined first referenced
symbol in file
--------- ----------------
_system ./Vector.obj

error: unresolved symbols remain
error: errors encountered during linking; "msa.out" not built

>> Compilation failure
make: *** [msa.out] Error 1
make: Target `all' not remade because of errors.