安装OPENSSH 和telnet. 遇到的问题?

在装过程中遇到:
[root@haocat biz]# rpm -ivh openssh-server-4.3p2-16.el5.i386.rpm

warning: openssh-server-4.3p2-16.el5.i386.rpm: Header V3 DSA signature: NOKEY, key ID 37017186

error: Failed dependencies:

       libwrap.so.0 is needed by openssh-server-4.3p2-16.el5.i386
请问这是什么原因?

我在装OPENSSH和TELNET都报出同样的错误,请高人指点.