libpython shared library cannot be found by python3-config on Mac

[astrobatty]

python3-config --ldflag reports -L/opt/miniconda3/lib/python3.12/config-3.12-darwin -ldl -framework CoreFoundation on Mac. However, libpython is not included in -L, so linking to the conda python shared library is impossible.

For reference, the brew installed python creates a symlink to libpython in the library returned by python3-config.

$ python3.13-config --ldflags
-L/opt/homebrew/opt/python@3.13/Frameworks/Python.framework/Versions/3.13/lib/python3.13/config-3.13-darwin -ldl -framework CoreFoundation

$ ls -lhg /opt/homebrew/opt/python@3.13/Frameworks/Python.framework/Versions/3.13/lib/python3.13/config-3.13-darwin
total 552
-rw-r--r--@ 1 admin   3.5K Feb  4  2025 config.c
-rw-r--r--@ 1 admin   1.7K Feb  4  2025 config.c.in
-rwxr-xr-x@ 1 admin    15K Feb  4  2025 install-sh
lrwxr-xr-x@ 1 admin    15B Feb  4  2025 libpython3.13.a -> ../../../Python
lrwxr-xr-x@ 1 admin    15B Feb  4  2025 libpython3.13.dylib -> ../../../Python
-rw-r--r--@ 1 admin   201K Feb 17  2025 Makefile
-rwxr-xr-x@ 1 admin   8.8K Feb  4  2025 makesetup
-rwxr-xr-x@ 1 admin   2.1K Feb 17  2025 python-config.py
-rw-r--r--@ 1 admin   3.8K Feb  4  2025 python.o
-rw-r--r--@ 1 admin    11K Feb  4  2025 Setup
-rw-r--r--@ 1 admin   954B Feb  4  2025 Setup.bootstrap
-rw-r--r--@ 1 admin    41B Feb  4  2025 Setup.local
-rw-r--r--@ 1 admin   6.6K Feb  4  2025 Setup.stdlib

Conda Info

active environment : base
    active env location : /opt/miniconda3
            shell level : 1
       user config file : /Users/batty/.condarc
 populated config files : /opt/miniconda3/.condarc
                          /Users/batty/.condarc
          conda version : 24.9.2
    conda-build version : not installed
         python version : 3.12.7.final.0
                 solver : classic
       virtual packages : __archspec=1=m1
                          __conda=24.9.2=0
                          __osx=15.7.7=0
                          __unix=0=0
       base environment : /opt/miniconda3  (writable)
      conda av data dir : /opt/miniconda3/etc/conda
  conda av metadata url : None
           channel URLs : https://conda.anaconda.org/conda-forge/osx-arm64
                          https://conda.anaconda.org/conda-forge/noarch
                          https://repo.anaconda.com/pkgs/main/osx-arm64
                          https://repo.anaconda.com/pkgs/main/noarch
                          https://repo.anaconda.com/pkgs/r/osx-arm64
                          https://repo.anaconda.com/pkgs/r/noarch
          package cache : /opt/miniconda3/pkgs
                          /Users/batty/.conda/pkgs
       envs directories : /opt/miniconda3/envs
                          /Users/batty/.conda/envs
               platform : osx-arm64
             user-agent : conda/24.9.2 requests/2.32.3 CPython/3.12.7 Darwin/24.6.0 OSX/15.7.7 aau/0.4.4 c/. s/. e/.
                UID:GID : 501:20
             netrc file : None
           offline mode : False

Note: reposting https://github.com/conda/conda/issues/16177#issuecomment-4649074170