解决方法
事实证明,源回购定义不包括在内.将以下内容添加为/etc/yum.repos.d/Centos-Source.repo：
[base-source] name=CentOS-$releasever - Base Source baseurl=http://mirror.centos.org/centos/$releasever/os/SRPMS/ enabled=0 [updates-source] name=CentOS-$releasever - Updates Source baseurl=http://mirror.centos.org/centos/$releasever/updates/SRPMS/ enabled=0 [addons-source] name=CentOS-$releasever - Addons Source baseurl=http://mirror.centos.org/centos/$releasever/addons/SRPMS/ enabled=0 [extras-source] name=CentOS-$releasever - Extras Source baseurl=http://mirror.centos.org/centos/$releasever/extras/SRPMS/ enabled=0 [centosplus-source] name=CentOS-$releasever - Plus Source baseurl=http://mirror.centos.org/centos/$releasever/centosplus/SRPMS/ enabled=0 [contrib-source] name=CentOS-$releasever - Contrib Source baseurl=http://mirror.centos.org/centos/$releasever/contrib/SRPMS/ enabled=0
