update

cmake/flags.cmake

@@ -48,6 +48,10 @@ list(APPEND PROJECT_CXXFLAGS_LIST
   -Wunused
 )
 
+if (PROJECT_ENABLE_LIBBITCOIN_SYSTEM AND PROJECT_IS_DARWIN)
+  list(APPEND PROJECT_CXXFLAGS_LIST -Wno-enum-constexpr-conversion)
+endif()
+
 if (NOT PROJECT_IS_DARWIN)
   list(APPEND PROJECT_CXXFLAGS_LIST 
     -Wduplicated-branches