libc {

  GLIBC_2.0 {

    # variables used in Mach-specific macros

    __mach_task_self_;

    __vm_page_size;

    # functions used in inline functions and macros

    __mach_port_deallocate; __mach_thread_self;

    # functions used by RPC stubs

    __mach_msg; __mach_msg_overwrite;

    __mig_allocate; __mig_deallocate; __mig_dealloc_reply_port;

    __mig_get_reply_port; __mig_put_reply_port;

    __mig_strncpy;

    # variables in normal name space

    vm_page_size;

    # functions in normal name space

    # e*

    evc_wait;

    # m*

    mach_error; mach_error_string; mach_error_type;

    mach_host_self;

    mach_msg; mach_msg_overwrite;

    mach_msg_destroy;

    mach_msg_send; mach_msg_receive;

    mach_msg_server; mach_msg_server_timeout;

    mach_open_devstream;

    mach_port_allocate; mach_port_allocate_name; mach_port_deallocate;

    mach_port_insert_right; mach_reply_port;

    mach_setup_thread;

    mach_setup_tls;

    mach_task_self;

    mach_thread_self;

    mig_allocate; mig_dealloc_reply_port; mig_deallocate;

    mig_get_reply_port; mig_init; mig_put_reply_port;

    # v*

    vm_allocate; vm_deallocate; vm_map;

    # s*

    swtch; swtch_pri;

    # t*

    task_create; task_set_special_port; task_suspend; task_terminate;

    thread_depress_abort; thread_switch;

  }

  GLIBC_2.2.5 {

    # internal functions used by other libraries (e.g. librt)

    __mach_msg_destroy; __mach_reply_port;

    # This was always there, but not exported as it should have been.

    mig_strncpy;

  }

  GLIBC_2.21 {

    __mach_host_self_;

  }

  HURD_CTHREADS_0.3 {

    __mutex_init; __mutex_lock; __mutex_lock_solid; __mutex_trylock;

    __mutex_unlock; __mutex_unlock_solid;

    __spin_lock; __spin_lock_init; __spin_lock_solid; __spin_try_lock;

    __spin_unlock;

  }

}