执行安装 rpm -ivh lib64stdc++6-4.6.1-2-mdv2011.0.x86_64.rpm 时提示以下错误: warning: lib64stdc++6-4.6.1-2-mdv2011.0.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 70771ff3: NOKEY Preparing... ########################################### [100%] file /usr/lib64/…