yum 升级的问题

Error: Missing Dependency: perl(Compress::Raw::Zlib) = 2.024 is needed by package perl-IO-Compress-2.030-1.el5.rf.noarch (dag)
 You could try using --skip-broken to work around the problem
 You could try running: package-cleanup --problems
                        package-cleanup --dupes
                        rpm -Va --nofiles --nodigest
The program package-cleanup is found in the yum-utils package.
[root@www ~]# 

解决： 

yum --skip-broken update