I first tried compiling 1.4, which worked fine except that chan_zap.so was not built. Repeated make clean and recompile, same result.
So I cleaned out 1.4 and built 1.2.14 on the same machine and chan_zap.so appeared correctly.
Perhaps there is something in the Makefile that might explain why I can’t compile 1.4 fully? If there is a component missing surely make would stop on error? Anyone else seen this behaviour?