System Variables in my C++ code?

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C++

On my desktop I have a system's variable name i.e. MYSTUFF, which points to C:\hippopotamus\in\diapers, but in my laptop MYSTUFF points to D:\hippopotamus\in\diapers. Having said that, when I compile I program on my desktop and then transfer it to my laptop, and visa versa, but the location of the stuff I need for my program, (i.e, images, sound files, etc.) is not even in the same hard drive. So the program needs to be recompiled.
I would like to compile in one machine and run it in the other one, not having to recompile.
I tried this, but to no avail:

std::wstring myPath = L"std::wstring sound_file(L"%MYSTUFF%\\Sound\\Thunder.wav");";

What can I do to solve this problem?

Thanks