Ok, I hate CentOS. Installing softwares often have failed dependencies and conflicts. Same with OCS NG.
I found EPEL repo, it have ocs-ng package so free me from install it from scratch.
rpm -Uvh http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5-3.noarch.rpm
yum install ocsinventory
Update: ocs-ng installation guide already note EPEL as requirement repo.
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