native-ref bytevector-s64-native-set!

      bytevector-ieee-single-ref bytevector-ieee-single-set!
      bytevector-ieee-single-native-ref bytevector-ieee-single-native-set!
      bytevector-ieee-double-ref bytevector-ieee-double-set!
      bytevector-ieee-double-native-ref bytevector-ieee-double-native-set!

      string->utf8 utf8->string)
     '(rnrs bytevectors))
    ((atomic-box?
      make-atomic-box atomic-box-ref atomic-box-set!
      atomic-box-swap! atomic-box-compare-and-swap!)
     '(ice-9 atomic))
    ((current-thread) '(ice-9 threads))
    ((class-of) '(oop goops))
    ((u8vector-ref
      u8vector-set! s8vector-ref s8vector-set!
      u16vector-ref u16vector-set! s16vector-ref s16vector-set!
      u32vector-ref u32vector-set! s32vector-ref s32vector-set!
      u64vector-ref u64vector-set! s64vector-ref s64vector-set!
      f32vector-ref f32vector-set! f64vector-ref f64vector-set!)
     '(srfi srfi-4))
    (else '(guile))))