If you want to install NoMachine on a Gentoo or Arch Linux distribution,  you have to download the compressed tar package from the web site:

https://www.nomachine.com/download

Then, to install NoMachine or any of the server packages:

1) Extract the archive in the /usr/NX directory:

# tar -C /usr/ -xzf nomachine_x.x.x...tar.gz

2) Run the installation script:

# /usr/NX/nxserver --install redhat

To install the NoMachine Enterprise Client instead:

1) Extract the archive in the /usr/NX directory:

# tar -C /usr/ -xzf nomachine-enterprise-client_x.x.x...tar.gz

2) Run the installation script:

# /usr/NX/nxclient --install redhat

Note for Gentoo users: installation could fail (e.g. on Gentoo 2006.1) either because some of the required programs (as cp, rm, touch, flock etc...) are missing or placed in a different path from the usual path used on redhat. In this case you can try to install the required programs or create symbolic links to them to let the setup script for completing the installation.