Conda MacOS Big Sur ld: unsupported tapi file type '!tapi-tbd' in YAML file

Question

When compiling a c++ project in a conda environment on MacOS Big Sur, the error ld: unsupported tapi file type '!tapi-tbd' in YAML file may occur. How to proceed?

Answer 1

On Big Sur, the SDK that comes with Command Line Tools is too new. An older one needs to be downloaded and used:

1. Download the 10.10 SDK "MacOSX10.10.sdk.tar.xz" from here.
2. Extract it: tar xf MacOSX10.10.sdk.tar.xz -C /opt
3. Add following lines to ~/.condarc:

conda_build:
  config_file: ~/.conda/conda_build_config.yaml

4. create ~/.conda/conda_build_config.yaml if it doesn't exist and add:

CONDA_BUILD_SYSROOT:
  - /opt/MacOSX10.10.sdk        # [osx]

Many thanks to ihnorton on this thread.