The develop branch is in flux right now and hence you are facing these issues. See: [develop branch] Celery deprecated. Long live Python RQ
For MacOS X installation use this: GitHub - frappe/bench: CLI to manage Multi-tenant deployments for Frappe apps. It will install the develop setup which is the ongoing frappe 7 development. Although there might be bugs, we are fixing them as fast as we can. We are using it live for our ERPNext account.
If you wish to run it for production, make sure all your branches are ‘master’ i.e. for bench-repo, frappe and erpnext
Unfortunately, git provided by the recent MacOSX breaks shallow clones. So, do a brew install git before you clone anything.