deploy.py fails to build

I'm trying to do a deployment of nfss, and I start with:
./deploy.py nf-stats-service.yaml.tmpl --working-dir ../tmp/ --build
in the juju-deployer directory, but I get:
Private PPAs: disabled
Preparing local branch upload...
Reusing local branch, fingerprint 5439fd39d0cfcd0db895852a57fe0238647183cd
Building charm: system-image-server
make: Nothing to be done for 'all'.
Building charm: key-secret-subordinate
make: Nothing to be done for 'all'.
Building charm: chroot-builder
make: Nothing to be done for 'all'.
Building charm: wsgi-app
make: Nothing to be done for 'all'.
Building charm: lander
make: Nothing to be done for 'all'.
Building charm: webui
uploading webui-content.tgz to swift
ERROR:root:Collect static files requires access to the "webui" module. Please run this script inside the project venv.
Makefile:17: recipe for target 'upload-content' failed
make: *** [upload-content] Error 1
Traceback (most recent call last):
  File "./juju-deployer/deploy.py", line 997, in <module>
    sys.exit(main())
  File "./juju-deployer/deploy.py", line 975, in main
    build_charms(working_dir)
  File "./juju-deployer/deploy.py", line 640, in build_charms
    subprocess.check_call(['make'], cwd=charm_path, env=os.environ)
  File "/usr/lib/python2.7/subprocess.py", line 540, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['make']' returned non-zero exit status 2

I tried doing
. .venv/bin/activate
first, but that doesn't seem to help.