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• OCIEnv : qsql_oci.h
• OCISvcCtx : qsql_oci.h
• off64_t : qfunctions_nacl.cpp
• Offset : qfontsubset.cpp
• OLE_COLOR : qfunctions_wince.h
• OSEventRef : qmacdefines_mac.h
• OSMenuRef : qmacdefines_mac.h
• OSPasteboardRef : qmacdefines_mac.h
• OSStatus : qmacdefines_mac.h
• OSViewRef : qmacdefines_mac.h
• OSWindowRef : qmacdefines_mac.h
• OverlapFunc : qregion_qws.cpp , qregion.cpp