Selecting nfs-utils package does not automatically select the rpcbind package (needed at runtime by rpc.statd) and does not check for RPC support in uclibc (needed at buildtime by rpcbind). NFS on embedded device ? Yeah, I need it on my BeagleBoneBlack for a cheap NAS :-)
Fixed in http://git.buildroot.net/buildroot/commit/package/nfs-utils?id=182520a8af734c735c4dbdff29dc07af1d615a0a.
Thank you very much for the fix !