I'm deploying a Mac OS X desktop application for Intel machines running 10.5 or 10.6. Apple introduced a new framework in 10.6 and when I target my app to 10.6, everything works perfectly. The framework is not present in 10.5 and I'd like to have a reduced functionality version for 10.5. Can somebody suggest how I can produce a single binary that will run under both 10.5 and 10.6 and allow me to use the new framework if the user is running 10.6? I sort of need the Mac OS X equivalent of "LoadLibraryA" in Windows. Thank you.