安装rpm-build包时与epel-release-6-8.noarch冲突，报错：
Transaction check error:
file /etc/rpm/macros.ghc-srpm from install of redhat-rpm-config-9.1.0-88.el7.centos.noarch conflicts with file from package epel-release-6-8.noarch
Error Summary
这个报错的意思大概是rpm-build安装时与机器上的epel-release-6-8.noarch冲突。可能机器上的yum.repos中有epel的安装源配置并且安装过。所以只需要清除就好
yum erase epel-release
再重新安装rpm-build
yum install -y rpm-build
