How to create shared_ptr for PGconn?

Hi,
Does anyone know how to create the shared_ptr for PGconn? I always get compile errors ...
Below is my code:-----------------------const char * dbInfo = "xxx";PGconn *conn = PGconnectdb(dbInfo);if (PGstatus(conn) != CONNECTION_OK) { std::cout << PQerrorMessage(conn) << std::endl; return 1;}
std::shared_ptr<PGconn> pConn(conn);-----------
Error messages for the code above:

main.cpp:153:27: note: in instantiation of function template specialization 'std::__1::shared_ptr<pg_conn>::shared_ptr<pg_conn, void>' requested here
std::shared_ptr<PGconn> pConn(rawConn);
/usr/local/Cellar/postgresql/9.4.1/include/libpq-fe.h:129:16: note: forward declaration of 'pg_conn'

typedef struct pg_conn PGconn;

Thanks,Chengyu