I've installed byobu on my mac os x mojave. 10.14.xx,
however when I run byobu-config the prompt returns the message

`ERROR:Could not import the python snack module`

I've tried `pip3 install snack` with no effect.
it gives me the

```
pip3 install snack
Collecting snack
  Using cached snack-0.0.3.tar.gz (155 kB)
    ERROR: Command errored out with exit status 1:
     command: /usr/local/bin/python3 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/wj/hcvrw53j2rlb_htp5ppq84t80000gn/T/pip-install-u4a4xlgu/snack/setup.py'"'"'; __file__='"'"'/private/var/folders/wj/hcvrw53j2rlb_htp5ppq84t80000gn/T/pip-install-u4a4xlgu/snack/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /private/var/folders/wj/hcvrw53j2rlb_htp5ppq84t80000gn/T/pip-install-u4a4xlgu/snack/pip-egg-info
         cwd: /private/var/folders/wj/hcvrw53j2rlb_htp5ppq84t80000gn/T/pip-install-u4a4xlgu/snack/
    Complete output (6 lines):
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/private/var/folders/wj/hcvrw53j2rlb_htp5ppq84t80000gn/T/pip-install-u4a4xlgu/snack/setup.py", line 47
        print GCC_VERSION
                        ^
    SyntaxError: Missing parentheses in call to 'print'. Did you mean print(GCC_VERSION)?
    ----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

```