>You may be missing the distro version of qemu (that is, your self-build
>qemu at /usr/local/bin/qemu-x86_64 is not the same as what RHEL ships,
>and since you are using the RHEL libvirt, it may not know to look for a
>self-built alternative).

Excuse me, but it seems that there is not way to uninstall the qemu which has been built from source.
There is no target for uninstall. Is it enough to run "rm -rf /usr/local/bin/qemu*" or there are some other config staffs in other system directories?