Install Geopandas/Fiona on mac OS Big Sur

I just tried to set up geopandas on mac OS Big Sur and ran into several problems, specifically this one appeared constantly:

/usr/local/Cellar/[email protected]/3.8.6_2/Frameworks/Python.framework/Versions/3.8/lib/python3.8/importlib/__init__.py:127: in import_module
  1 #!/bin/bash
    return _bootstrap._gcd_import(name[level:], package, level)
  1 #!/bin/bash
<frozen importlib._bootstrap>:1014: in _gcd_import
    ???
<frozen importlib._bootstrap>:991: in _find_and_load
    ???
  1 #!/bin/bash
<frozen importlib._bootstrap>:975: in _find_and_load_unlocked
    ???
<frozen importlib._bootstrap>:671: in _load_unlocked
    ???
/usr/local/lib/python3.8/site-packages/_pytest/assertion/rewrite.py:170: in exec_module
    exec(co, module.__dict__)
Fiona/tests/conftest.py:13: in <module>
    import fiona
Fiona/fiona/__init__.py:84: in <module>
    from fiona.collection import BytesCollection, Collection
Fiona/fiona/collection.py:9: in <module>
    from fiona.ogrext import Iterator, ItemsIterator, KeysIterator
E   ModuleNotFoundError: No module named 'fiona.ogrext'

Researching the web told me that

fiona might not work with Python 3.9, so I downgraded to Python 3.8
I have been trying to install the 2.0dev version, but instead I should've been installing the latest stable version (as of writing this post: https://github.com/Toblerity/Fiona/releases/tag/1.8.13.post1)
Homebrew installed GDAL 3.2 which apparently misses some symbols that are needed, so I decided to downgrade to GDAL 2.4
eventually I found a post that said that they never had any luck with Homebrew GDAL, so I installed GDAL Complete 2.4 from KyngChaos
also I uninstalled Homebrew GDAL, i.e. ran brew uninstall gdal

Eventually, I had success running the following:

#!/bin/bash
cd Fiona-1.8.13.post1
GDAL_CONFIG=/Library/Frameworks/GDAL.framework/unix/bin/gdal-config \
PROJ_LIB=/Library/Frameworks/PROJ.framework/unix/share \
python setup.py build_ext \
    -I/Library/Frameworks/GDAL.framework/unix/include\
    -L/Library/Frameworks/GDAL.framework/unix/lib\
    -I/Library/Frameworks/PROJ.framework/unix/include\
    -L/Library/Frameworks/PROJ.framework/unix/lib\
    -lgdal -lproj install --gdalversion 2.4

benmaier/install_fiona_for_geopandas_on_mac_os_big_sur.md

Install Geopandas/Fiona on mac OS Big Sur