天津国药物流招聘信息:请教在linux下GTK中遇到的几个问题

我在用GTK编写界面的时候，遇到了几个警告：

In function `on_tel_book_button_clicked':
callbacks.c:208: warning: passing arg 1 of `gtk_clist_clear' from incompatible pointer type
callbacks.c: In function `on_send_combo_entry_changed':
callbacks.c:257: warning: initialization discards qualifiers from pointer target type
callbacks.c: In function `on_call_combo_entry_changed':
callbacks.c:346: warning: initialization discards qualifiers from pointer target type
callbacks.c: In function `on_ok_button_clicked':
callbacks.c:376: warning: initialization discards qualifiers from pointer target type
callbacks.c:377: warning: initialization discards qualifiers from pointer target type
callbacks.c:378: warning: initialization discards qualifiers from pointer target type
callbacks.c:434: warning: passing arg 1 of `gtk_clist_clear' from incompatible pointer type
callbacks.c: In function `on_delete_tel_button_clicked':
callbacks.c:654: warning: passing arg 1 of `gtk_clist_get_text' from incompatible pointer type

这些警告都是什么意思啊？还有，怎么修改？谢谢了