fix issue in macos build [skip ci]

Author: alonyado

.github/workflows/mac_build.yml

@@ -101,3 +101,8 @@ jobs:
           # Run the installation
           export CMAKE_ARGS="-DBoost_NO_BOOST_CMAKE=ON"
           pip install . -vv --no-build-isolation
+
+      - name: Test MedPython
+        run: |
+          python -c 'import med'
+

Internal/MedPyExport/generate_binding/MedPython/CMakeLists.txt

@@ -94,6 +94,10 @@ elseif(APPLE)
         _lightgbm_static
         OpenMP::OpenMP_CXX
     )
+
+    set_target_properties(medpython PROPERTIES 
+        LINK_FLAGS "-undefined dynamic_lookup"
+    )
 else()
     # --- LINUX ---
      if (USE_BOOST_SHARED_LIBS)