unable to execute 'bazel': No such file or directory

Hi all,
I recently upgraded to Python3.8 from Python3.7. However, I have been getting the following error log when I run pip3 install tensorflow-probability on my terminal:

Building wheels for collected packages: dm-tree
  Building wheel for dm-tree (setup.py) ... error
  ERROR: Command errored out with exit status 1:
   command: /usr/local/opt/python@3.8/bin/python3.8 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/sl/n1gk9z7s6n1_zsljjk_bpnpm0000gn/T/pip-install-nt10ufzu/dm-tree/setup.py'"'"'; __file__='"'"'/private/var/folders/sl/n1gk9z7s6n1_zsljjk_bpnpm0000gn/T/pip-install-nt10ufzu/dm-tree/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' bdist_wheel -d /private/var/folders/sl/n1gk9z7s6n1_zsljjk_bpnpm0000gn/T/pip-wheel-ua6p78cp
       cwd: /private/var/folders/sl/n1gk9z7s6n1_zsljjk_bpnpm0000gn/T/pip-install-nt10ufzu/dm-tree/
  Complete output (13 lines):
  running bdist_wheel
  running build
  running build_py
  creating build
  creating build/lib.macosx-10.13-x86_64-3.8
  creating build/lib.macosx-10.13-x86_64-3.8/tree
  copying tree/__init__.py -> build/lib.macosx-10.13-x86_64-3.8/tree
  copying tree/tree_test.py -> build/lib.macosx-10.13-x86_64-3.8/tree
  copying tree/tree_benchmark.py -> build/lib.macosx-10.13-x86_64-3.8/tree
  running build_ext
  bazel build //tree:_tree --symlink_prefix=build/temp.macosx-10.13-x86_64-3.8/bazel- --compilation_mode=opt
  unable to execute 'bazel': No such file or directory
  error: command 'bazel' failed with exit status 1
  ----------------------------------------
  ERROR: Failed building wheel for dm-tree
  Running setup.py clean for dm-tree
Failed to build dm-tree
Installing collected packages: dm-tree, tensorflow-probability, gpflow
    Running setup.py install for dm-tree ... error
    ERROR: Command errored out with exit status 1:
     command: /usr/local/opt/python@3.8/bin/python3.8 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/sl/n1gk9z7s6n1_zsljjk_bpnpm0000gn/T/pip-install-nt10ufzu/dm-tree/setup.py'"'"'; __file__='"'"'/private/var/folders/sl/n1gk9z7s6n1_zsljjk_bpnpm0000gn/T/pip-install-nt10ufzu/dm-tree/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /private/var/folders/sl/n1gk9z7s6n1_zsljjk_bpnpm0000gn/T/pip-record-3ceix6xa/install-record.txt --single-version-externally-managed --compile --install-headers /usr/local/include/python3.8/dm-tree
         cwd: /private/var/folders/sl/n1gk9z7s6n1_zsljjk_bpnpm0000gn/T/pip-install-nt10ufzu/dm-tree/
    Complete output (13 lines):
    running install
    running build
    running build_py
    creating build
    creating build/lib.macosx-10.13-x86_64-3.8
    creating build/lib.macosx-10.13-x86_64-3.8/tree
    copying tree/__init__.py -> build/lib.macosx-10.13-x86_64-3.8/tree
    copying tree/tree_test.py -> build/lib.macosx-10.13-x86_64-3.8/tree
    copying tree/tree_benchmark.py -> build/lib.macosx-10.13-x86_64-3.8/tree
    running build_ext
    bazel build //tree:_tree --symlink_prefix=build/temp.macosx-10.13-x86_64-3.8/bazel- --compilation_mode=opt
    unable to execute 'bazel': No such file or directory
    error: command 'bazel' failed with exit status 1
    ----------------------------------------
ERROR: Command errored out with exit status 1: /usr/local/opt/python@3.8/bin/python3.8 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/sl/n1gk9z7s6n1_zsljjk_bpnpm0000gn/T/pip-install-nt10ufzu/dm-tree/setup.py'"'"'; __file__='"'"'/private/var/folders/sl/n1gk9z7s6n1_zsljjk_bpnpm0000gn/T/pip-install-nt10ufzu/dm-tree/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /private/var/folders/sl/n1gk9z7s6n1_zsljjk_bpnpm0000gn/T/pip-record-3ceix6xa/install-record.txt --single-version-externally-managed --compile --install-headers /usr/local/include/python3.8/dm-tree Check the logs for full command output.

Start with the reported pip install tensorflow-probability output and the dm-tree build step invoking bazel build //tree:_tree. Check how the Python 3.8 installation reaches dm-tree and why the bazel executable is unavailable. Done means the documented installation path completes without the reported build failure.