centos8安装gcc出现下载元数据失败的报错

• url改对进行下载

find /etc/yum.repos.d/ -name "*.repo" | xargs  sed -i 's/$releasever/8-stream/g'
find /etc/yum.repos.d -name "*.repo" | xargs  sed -i 's/$basearch/x86_64/g'
然后下载gcc