NS=1 system build broken

[sshane]

NS=1 ./build_system.sh

Starting agnos-meta-builder container
Creating empty filesystem
Mounting empty filesystem
Building and extracting agnos-builder docker image

========================================
Failed: unknown flag: --output
========================================
tar: This does not look like a tar archive
tar: Exiting with failure status due to previous errors
Cleaning up containers:
b83c90da477acf749999928ac8d42d10a278ea3564f4c236f46f4e48df4eef56