after a clean install, /usr/bin/nxnode --agent brought an unsatisfied dependency to libXcomposite.so.1 - which disappeared after installing libXcomposite - everything worked fine then - so it's just a dep which has to get into the ebuild Reproducible: Always fixed at home - explained above - very fast fix
libXcomposite DEPEND added to nx-3.0.0, thanks for the report!