安裝rpm-build包時與epel-release-6-8.noarch衝突，報錯：
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
這個報錯的意思大概是rpm-build安裝時與機器上的epel-release-6-8.noarch衝突。可能機器上的yum.repos中有epel的安裝源配置並且安裝過。所以只需要清除就好
yum erase epel-release
再重新安裝rpm-build
yum install -y rpm-build
