You need QuickTime SDK 7.3 for Windows to build qaac. You can download QuickTime SDK from http://developer.apple.com/quicktime/ (registration is required).
SDK is installed under C:Program FilesQuickTime SDK (or C:Program Files (x86)QuickTime SDK, if you are using 64bit OS).
You have to modify project files(vcxproj), if your SDK install directory is different from the project settings.