How to handle a class name conflict when porting old code?

// In a wrapper header, eg: include_oldlib.h...

namespace oldlib
{
   #include "oldlib.h"
};

#ifndef DONT_AUTO_INCLUDE_OLD_NAMESPACE
using namespace oldlib;
#endif

#define TObject TMadeUpNameObject

namespace oldlib
{
   #inclcude "oldlib.h"
};

#ifdef Symbol
#undef Symbol
#define Symbol ThirdPartySymbol
#endif
#include <third_party_header.h>
#undef Symbol