Remove ISymbianSDK#getPrefixFile. You can get this from ISDKBuildInfo#getPrefixFromVariantCfg().
// stdafx.cpp : source file that includes just the standard includes
// GetTRKVersion.pch will be the pre-compiled header
// stdafx.obj will contain the pre-compiled type information
#include "stdafx.h"
// TODO: reference any additional headers you need in STDAFX.H
// and not in this file