正常安装命令：
yum install jsoncpp-devel libuuid-devel curl-devel报错信息：
warning: /var/cache/yum/x86_64/7/okay/packages/jsoncpp-1.6.5-1.el7.centos.x86_64.rpm: Header V4 RSA/SHA256 Signature, key ID 13d0a55d: NOKEY Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-OKAY The GPG keys listed for the "Extra OKay Packages for Enterprise Linux - x86_64" repository are already installed but they are not correct for this package. Check that the correct key URLs are configured for this repository. Failing package is: jsoncpp-1.6.5-1.el7.centos.x86_64 GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-OKAY解决方案:(后加 --nogpgcheck来强制安装）
yum install jsoncpp-devel libuuid-devel curl-devel --nogpgcheck