src/third_party/musl/arch/powerpc/bits/endian.h

#ifdef __BIG_ENDIAN__
  #if __BIG_ENDIAN__
    #define __BYTE_ORDER __BIG_ENDIAN
  #endif
#endif /* __BIG_ENDIAN__ */

#ifdef __LITTLE_ENDIAN__
  #if __LITTLE_ENDIAN__
    #define __BYTE_ORDER __LITTLE_ENDIAN
  #endif
#endif /* __LITTLE_ENDIAN__ */

#ifndef __BYTE_ORDER
  #define __BYTE_ORDER __BIG_ENDIAN
#endif