Alright, so great news! Finally got this thing to compile 
Turns out those preprocessor macro warnings were causing a problem… I went through all the code and simply removed all the references to those macros which aren’t needed in my case. As far as I know, ASIO is only really implemented in Windows, so need for branching cases for MAC/SGI/BEOS etc…
Shyoh, very happy here! Now onto the real work and getting ASIO into this system! Wish me luck!