setjmp/Versions

libc {
  GLIBC_2.0 {
    # functions with special/multiple interfaces
    _longjmp; __sigsetjmp; _setjmp;

    # l*
    longjmp;

    # s*
    setjmp;
  }
  GLIBC_PRIVATE {
    # helper functions
    __libc_longjmp; __libc_siglongjmp;
  }
}