MSBYTE_FIRST
#ifdef MSBYTE_FIRST
#ifndef MSBYTE_FIRST
#ifdef MSBYTE_FIRST
#if !defined(MSBYTE_FIRST) && !defined(MSBIT_FIRST) /* XXX other cases */
#if !defined(MSBYTE_FIRST) && !defined(MSBIT_FIRST) /* XXX other cases */