Pip Install Arkouda fails even when Chapel installed

I'm attempting to install the PyPi client to Arkouda

> pip install arkouda

...
      File "/usr/lib/python3.7/distutils/cmd.py", line 313, in run_command
        self.distribution.run_command(command)
      File "/usr/lib/python3.7/distutils/dist.py", line 985, in run_command
        cmd_obj.run()
      File "/tmp/pip-install-8y41snys/arkouda/installers.py", line 60, in custom_run
        raise ArkoudaBuildError("Chapel is not installed, Arkouda cannot be built")
    installers.ArkoudaBuildError: Chapel is not installed, Arkouda cannot be built

But this shows

> chpl --version
chpl version 1.23.0 pre-release (63dade1a2b)
Copyright 2020 Hewlett Packard Enterprise Development LP
Copyright 2004-2019 Cray Inc.
(See LICENSE file for more details)