Can't import fiona because `libgdal.29.dylib` can't be found

Expected behavior and actual behavior.

import fiona should import the fiona module.

Instead, I see the following:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/opt/homebrew/lib/python3.9/site-packages/fiona/__init__.py", line 86, in <module>
    from fiona.collection import BytesCollection, Collection
  File "/opt/homebrew/lib/python3.9/site-packages/fiona/collection.py", line 11, in <module>
    from fiona.ogrext import Iterator, ItemsIterator, KeysIterator
ImportError: dlopen(/opt/homebrew/lib/python3.9/site-packages/fiona/ogrext.cpython-39-darwin.so, 0x0002): Library not loaded: /opt/homebrew/opt/gdal/lib/libgdal.29.dylib
  Referenced from: /opt/homebrew/lib/python3.9/site-packages/fiona/ogrext.cpython-39-darwin.so
  Reason: tried: '/opt/homebrew/opt/gdal/lib/libgdal.29.dylib' (no such file), '/usr/local/lib/libgdal.29.dylib' (no such file), '/usr/lib/libgdal.29.dylib' (no such file), '/opt/homebrew/Cellar/gdal/3.4.1_1/lib/libgdal.29.dylib' (no such file), '/usr/local/lib/libgdal.29.dylib' (no such file), '/usr/lib/libgdal.29.dylib' (no such file)

Operating system

M1 Mac running macOS Monterey 12.1

Fiona and GDAL version and provenance

Fiona version 1.8.20 installed via pip

GDAL version 3.4.1_1 installed with brew

I “fixed” the issue simply by running the following command:

cp /opt/homebrew/Cellar/gdal/3.4.1_1/lib/libgdal.30.dylib /opt/homebrew/Cellar/gdal/3.4.1_1/lib/libgdal.29.dylib

But I thought I would report a bug because I couldn’t find any information on this issue, and the “solution” is not obvious.

[krober10nd]

I faced the same issue. I had to rebuild from source. Reinstalling via pip did not avoid the error.

[sgillies]

@nicolegoebel renaming the libraries will almost certainly break something. I can’t recommend anything other than what @krober10nd has done. Install GDAL using homebrew, make sure that gdal-config is on your executable path, and then pip install --no-binary=fiona fiona.