wxPython failing to install on MacOS 10.14 with python 3.8.0 using pyenv

I have been having trouble trying to get wxPython to install in a pyenv 
virtualenv using python 3.8.0 on Mac OS X 10.14 (Mojave).

I have installed (and reinstalled) the xcode Command line tools, built the 
python version with following command to include the `--enable-framework` 
parameter:

```
env CFLAGS="-I$(xcrun --show-sdk-path)/usr/include" 
PYTHON_CONFIGURE_OPTS="--enable-framework=$(pyenv root)/versions/3.8.0 
CC=clang" pyenv install 3.8.0
```

However, when I run:

```
pip install wxpython
```

I get the following error:

```
    ...
    checking for SDK directory 
/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk... exists
    checking if C compiler (gcc -isysroot 
/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk 
-mmacosx-version-min=10.6) works with SDK/version options... yes
    checking if C++ compiler (g++ -isysroot 
/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk 
-mmacosx-version-min=10.6) works with SDK/version options... configure: 
error: in 
`/private/var/folders/f6/<random_string>/T/pip-install-<rand_str>/wxpython/build/wxbld':
    configure: error: no.  Try a different SDK
    See `config.log' for more details
    Error running configure
    ERROR: failed building wxWidgets
    Traceback (most recent call last):
      File "build.py", line 1325, in cmd_build_wx
        wxbuild.main(wxDir(), build_options)
      File 
"/private/var/folders/f6/<random_string>/T/pip-install-<rand_str>/wxpython/buildtools/build_wxwidgets.py", 
line 372, in main
        exitIfError(wxBuilder.configure(dir=wxRootDir, 
options=configure_opts),
      File 
"/private/var/folders/f6/<random_string>/T/pip-install-<rand_str>/wxpython/buildtools/build_wxwidgets.py", 
line 85, in exitIfError
        raise builder.BuildError(msg)
    buildtools.builder.BuildError: Error running configure
    Finished command: build_wx (0m2.108s)
    Finished command: build (0m2.108s)
    Command 
'"/Users/<user_name>/.pyenv/versions/3.8.0/envs/<pyenv_project_name>/bin/python3.8" 
-u build.py build' failed with exit code 1.
```
If I run the installation on a pyenv virtualenv using 3.6.9 then everything 
goes through smoothly. I have had issues getting the 3.7.X versions of 
python to build correctly on MacOS when using pyenv and enableing 
frameworks.

If I run the same `pip install wxpython` on a Linux VM (Mint 19) with pyenv 
and python 3.8.0 everything goes smoothly and I don't get the same error 
searching for the C++ compiler.

Normally I am a Linux user so any advice from Mac users that might have 
seen this issue, or something similar would be greatfully received.

Cheers,

Mark

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