ros-noetic-tf2-py.osx.patch

diff --git a/CMakeLists.txt b/CMakeLists.txt
index bb53f9d3..53f56f01 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -88,8 +88,9 @@ catkin_package(
 
 # Dynamic linking with tf worked OK, except for exception propagation, which failed in the unit test.
 # so build with the objects directly instead.
-
-link_libraries(${PYTHON_LIBRARIES})
+if(NOT APPLE)
+  link_libraries(${PYTHON_LIBRARIES})
+endif()
 add_library(tf2_py src/tf2_py.cpp)
 target_link_libraries(tf2_py ${catkin_LIBRARIES})
 add_dependencies(tf2_py ${catkin_EXPORTED_TARGETS})
@@ -101,6 +102,10 @@ else()
   set_target_properties(tf2_py PROPERTIES COMPILE_FLAGS "-g -Wno-missing-field-initializers")
   set_target_properties(tf2_py PROPERTIES OUTPUT_NAME tf2 PREFIX "_" SUFFIX ".so")
 endif()
+if(APPLE)
+  set_target_properties(tf2_py PROPERTIES
+                        LINK_FLAGS "-undefined dynamic_lookup")
+endif()
 set_target_properties(tf2_py PROPERTIES
   ARCHIVE_OUTPUT_DIRECTORY ${CATKIN_DEVEL_PREFIX}/${CATKIN_PACKAGE_PYTHON_DESTINATION}
   LIBRARY_OUTPUT_DIRECTORY ${CATKIN_DEVEL_PREFIX}/${CATKIN_PACKAGE_PYTHON_DESTINATION}