!libc_pre_versions
libc {
  GLIBC_2.2 {
    ioperm; iopl;
    inb; inw; inl;
    _inb; _inw; _inl;
    outb; outw; _outl;
    _outb; _outw; _outl;
    pciconfig_read; pciconfig_write;

    # linuxthreads
    __clone2;
  }
  GLIBC_2.2.2 {
    # w*
    wordexp;
  }
  GLIBC_2.3.3 {
    # Changed PTHREAD_STACK_MIN.
    pthread_attr_setstack;
    pthread_attr_setstacksize;
  }
  GLIBC_2.2.6 {
    getunwind;
  }
  GLIBC_2.24 {
    recvmsg; sendmsg;
  }
}