luadec-5.1 fails to compile undefined luaS_new about luadec HOT 2 CLOSED

// lua-5.2
LUALIB_API int (luaL_loadfilex) (lua_State *L, const char *filename, const char *mode);
#define luaL_loadfile(L,f)  luaL_loadfilex(L,f,NULL)

LUAI_FUNC TString *luaS_newlstr (lua_State *L, const char *str, size_t l);
LUAI_FUNC TString *luaS_new (lua_State *L, const char *str);

// lua-5.1
LUALIB_API int (luaL_loadfile) (lua_State *L, const char *filename);

#define luaS_new(L, s)  (luaS_newlstr(L, s, strlen(s)))
LUAI_FUNC TString *luaS_newlstr (lua_State *L, const char *str, size_t l);