Fix linking with python with homebrew on Mac Os

Author: thelfer

INSTALL-cmake.md

@@ -55,6 +55,10 @@ Options
 - `enable-static`: compiles static libraries
 - `enable-doxygen-doc`: enable the generation of the API documentation
   using with `Doxygen`.
+- `disable_python_library_linking`: when set to `ON`, this option
+  disables the link to `python` libraries. This is required when building
+  against `anaconda` on `Mac OS`. This can be enabled by default because
+  it will lead to a failure with the `python` version of homebrew.
 
 `cmake` usefull variables
 =======================

bindings/python/src/CMakeLists.txt

@@ -50,17 +50,17 @@ function(mgis_python_module name output_name)
         MFrontGenericInterface ${CONAN_LIBS})
 	endif(APPLE)
   else(MGIS_USES_CONAN)
-    if(APPLE)
+    if(disable_python_library_linking)
       target_link_libraries(${module}
         PRIVATE
         MFrontGenericInterface
         ${Boost_NUMPY_LIBRARY} ${Boost_PYTHON_LIBRARY})
-    else(APPLE)
+    else(disable_python_library_linking)
       target_link_libraries(${module}
         PRIVATE
         MFrontGenericInterface
         ${Boost_NUMPY_LIBRARY} ${Boost_PYTHON_LIBRARY} ${PYTHON_LIBRARIES})
-	endif(APPLE)
+	endif(disable_python_library_linking)
   endif(MGIS_USES_CONAN)
   # installation
   install(TARGETS ${module}