Help in operator << >> overloading in Library

[mce]

class VAR_EXPORT VAR
{
public:



};
VAR_EXPORT QDataStream &operator>>(QDataStream &p_stream, QSharedPointer<Data>& p_data)
	{

	.....................
	}
  VAR_EXPORT QDataStream & operator<<(QDataStream &p_stream, const Data & p_data)
	{
		..........
	}
	
  VAR_EXPORT QDataStream &operator<<(QDataStream &p_stream, QSharedPointer<Data> p_data)
	{
		return p_stream << *p_data;
	}

Above compile and build ok. But when i build another library that use the above, i was shown with all errors complaining operator << and >> definition of dllimport finction not allowed

error C2491: 'operator >>' : definition of dllimport function not allowed
error C2491: 'operator <<' : definition of dllimport function not allowed