Linking shared library fails on MacOS

Code
1

There are 2 targets (the code is simplified):

  1. far2m - an executable that also exports symbols, e.g.
if(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
    add_executable(far2m MACOSX_BUNDLE ${SOURCES} "DE/Far.icns")
else()
    add_executable(far2m ${SOURCES})
endif()
set_target_properties(far2m PROPERTIES ENABLE_EXPORTS TRUE)
  1. luafar - a dynamic library
    add_library (luafar SHARED ${SOURCES})
    target_link_libraries(luafar far2m)

This code works fine on Linux but not on MacOS. The following errors are issued:

[ 51%] Linking CXX shared library ../install/far2m.app/Contents/MacOS/Plugins/luafar/luafar.so
Undefined symbols for architecture arm64:
  "_WINPORT_CloseHandle", referenced from:
      _su_FileClose in sysutils.c.o
      _ExtractFileTime in win.c.o
      ...
  "_WINPORT_CompareString", referenced from:
      _win_CompareString in win.c.o
  "_WINPORT_CreateDirectory", referenced from:
      _win_CreateDir in win.c.o
      ...

These undefined symbols are contained in far2m.
I have zero experience with MacOS and never had a Mac.
Could you please advise what is incorrect in my code and how it could be fixed?