Guy Roussin wrote: > ./server/livefilter.h:18: warning: ISO C++ forbids declaration of 'cStreamdevLiveStreamer' with no type > ./server/livestreamer.h:22: warning: ISO C++ forbids declaration of 'cStreamdevLiveStreamer' with no type My guess: In both cases, there is a "friend class cStreamdevLiveStreamer;" declaration that seems to act as a forward declaration too, and GCC4 doesn't accept that any more. Try adding an explicit "class cStreamdevLiveStreamer;" forward declaration in front of the two class declarations, eg. at livestreamer.h:15 and at livefilter.h:13. Cheers, Udo
