I haven't actually installed psyche yet, but this is what I expect. The C++ <==== ABI has changed.
1. C apps should not be affected. 2. You can't reliably link old ABI C++ code with new ABI C++ code, so you need to recompile your C++ libs if you need to link new code to them. 3. Existing C++ apps should still work if statically linked. Maybe they break if linked to shared libs. All this is just my guesses.
