Get unresolved external error when try get syste volume

I try to use new feature of last build (265), obtaining and controling global sound volume level. But get unresolved external error in WinXP application (I haven't try this in Windows Mobile project jet).
Full message says:
unresolved external symbol "__declspec(dllimport) public: unsigned long __thiscall SoundSystem::getVolume(void)" (__imp_?getVolume@SoundSystem@@QAEKXZ)
Maybe I need to link with additional library?
Full message says:
unresolved external symbol "__declspec(dllimport) public: unsigned long __thiscall SoundSystem::getVolume(void)" (__imp_?getVolume@SoundSystem@@QAEKXZ)
Maybe I need to link with additional library?