安装rrdtool时出错，如下：
error: Failed dependencies:
perl(RRDp) is needed by rrdtool-1.2.30-1.wrl.i386
perl(RRDs) is needed by rrdtool-1.2.30-1.wrl.i386
依赖关系出错，下载相同版本的perl-rrdtool-1.2.30-1.el5.rf.i386.rpm
rrdtool-devel-1.2.30-1.el5.rf.i386.rpm
然后 rpm -ivh perl-rrdtool-1.2.30-1.el5.rf.i386.rpm rrdtool-1.2.30-1.el5.wrl.i386.rpm rrdtool-devel-1.2.30-1.el5.rf.i386.rpm
OK