Fix GCC Makefile build on Mac OS X platform.

Source/Tools/PackageTool/CMakeLists.txt

@@ -30,4 +30,7 @@ define_source_files ()
 set (LIBS ../../ThirdParty/LZ4)
 
 # Setup target
+if (APPLE)
+    setup_macosx_linker_flags (CMAKE_EXE_LINKER_FLAGS)
+endif ()
 setup_executable ()