How to change qemu-kvm version on Eucalyptus cloud-in-a-box?

Hi,

I am trying to use libvmi tool on KVM virtual machine running on Eucalyptus
cloud. It is a cloud-in-a-box 3.4.2 version. To use libvmi on KVM, it
requires me to change the qemu-kvm that Eucalyptus by default uses. So I
did a patch to the qemu-kvm-1.2.0 source code, compiled it and "make &

https://github.com/bdpayne/libvmi/tree/master/tools/qemu-kvm-patch.

Now I need to make sure my system will use this newly installed version of
qemu-kvm when running KVM virtual machines. Could anyone tell me how to
setup so that Eucalyptus would use my newly-installed qemu-kvm when
launching new instances?

I tried "yum erase qemu-kvm", hoping to erase the original version of
qemu-kvm so that maybe Eucalyptus would have to use the qemu I just
compiled and installed. However when I used "yum erase qemu-kvm", it said
"eucalyptus-nc" would also need to be erased for depedency reason, so I
didn't continue:

[root [ at ] db05 qemu-kvm-1.2.0]# yum erase qemu-kvm
Loaded plugins: fastestmirror, refresh-packagekit
Setting up Remove Process
Resolving Dependencies
--> Running transaction check
---> Package qemu-kvm.x86_64 2:0.12.1.2-2.415.el6_5.7 will be erased
--> Processing Dependency: kvm for package:
eucalyptus-nc-3.4.2-0.0.548.el6.x86_64
--> Running transaction check
---> Package eucalyptus-nc.x86_64 0:3.4.2-0.0.548.el6 will be erased
--> Finished Dependency Resolution

Dependencies Resolved

=============================================================================================================================================================
Package Arch
Version
Repository Size
=============================================================================================================================================================
Removing:
qemu-kvm x86_64
2:0.12.1.2-2.415.el6_5.7
@updates/3.4 4.3 M
Removing for dependencies:
eucalyptus-nc x86_64
3.4.2-0.0.548.el6
@eucalyptus/3.4 3.1 M

Transaction Summary
=============================================================================================================================================================
Remove 2 Package(s)

Installed size: 7.4 M
Is this ok [y/N]: n
Exiting on user Command

Thanks,
Min