Just simply select the recipe.

software/kvm/instance.cfg

@@ -6,7 +6,7 @@ eggs-directory = ${buildout:eggs-directory}
 develop-eggs-directory = ${buildout:develop-eggs-directory} 
 
 [kvminstance]
-recipe = ${instance-recipe:egg}:${instance-recipe:module}
+recipe = slapos.cookbook:kvm
 qemu_path = ${kvm:location}/bin/qemu-system-x86_64
 qemu_img_path = ${kvm:location}/bin/qemu-img
 #slapmonitor_path = ${buildout:bin-directory}/slapmonitor