LinuxQuestions.org - Unknown graphic type for the guest (virt-viewer)

I'm using Slackware v13.37 64 bit. I'm testing KVM on the machine and I've installed a Slackware guest on it. I can also connect and view the guest machine using virt-manager.

Using

Code:

virt-viewer slackware

on the host, I'm getting:

Code:

Unknown graphic type for the guest slackware

However, I can connect using vncviewer by specifying localhost:5900.

This is my virt-install command:

Code:

virt-install --connect qemu:///system \

  --os-type linux \

  --hvm \

  --name slackware \

  --ram 512 \

  --disk path=/dev/vg01/slackware \

  --graphics vnc \

  --network bridge=virbr0,model=e1000,mac=DE:AD:BE:EF:13:4D \

  --cdrom /iso/slackware64-13.37.iso \

  --noautoconsole

Is there something I need to install? Where do I check for the related log?