安装lumanager出现这个提示,安装不上，是什么原因？

ppmm

Error: Package: httpd-devel-2.2.15-5.el6.centos.i686 (centos-burstnet)
           Requires: httpd = 2.2.15-5.el6.centos
           Installed: httpd-2.2.21-lxcenter.2.i386 (@lxcenter-updates)
               httpd = 2.2.21-lxcenter.2
           Available: httpd-2.2.15-5.el6.centos.i686 (centos-burstnet)
               httpd = 2.2.15-5.el6.centos
You could try using --skip-broken to work around the problem
cronie-1.4.4-2.el6.i686 has missing requires of /usr/sbin/sendmail

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