jack-audio-connection-kit-0.103.0.ebuild has a USE flag for including netjack, but the SConstruct file used to build this support specifies use of libsamplerate. I.E. the ebuild needs to list libsamplerate as a dependency when the netjack flag is on. Reproducible: Always (However, I still can't get any sound to be produced via jacknet_client)
Fixed in tree.