Hi all, I just built Csound5 on a clean Linux box and I had one glitch - my first build died because I didn't have ladspa.h . Everything worked once I installed it, but shouldn't INSTALL mention that you need this header? After all, it carefully describes everything else necessary for a successful build. (NB: I didn't customise the build in any way, other than passing prefix=/usr to scons .) Cheers, Jeremy Henty