Just did a fresh install of Arch on my cubox-i4pro. Setup NFS following the docs. I've set it up before many times. This time it wouldn't mount.
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● rpcbind.service - RPC bind service
Loaded: loaded (/usr/lib/systemd/system/rpcbind.service; indirect; vendor preset: disabled)
Active: inactive (dead) since Tue 2015-05-19 23:40:22 EDT; 5s ago
Process: 506 ExecStart=/usr/bin/rpcbind -w ${RPCBIND_ARGS} (code=exited, status=0/SUCCESS)
Main PID: 466 (code=exited, status=1/FAILURE)
May 19 23:40:22 Cubox-i systemd[1]: Starting RPC bind service...
May 19 23:40:22 Cubox-i rpcbind[506]: /usr/bin/rpcbind: Symbol `svc_auth_none' has different size in shared object, consider re-linking
May 19 23:40:22 Cubox-i rpcbind[507]: cannot get uid of 'rpc': Success
May 19 23:40:22 Cubox-i systemd[1]: Started RPC bind service.
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Once I manually added the RPC user and group it started working. I'm not sure which package would add the user so I just tagged this threads NFS.