In the past we used the VMware-vix-disklib-5.5.2-1890828.x86_64.tar.gz for VSphere 5.5 which was pretty easy to install. VMWare included a script called vmware-install.pl which did all the work for you. In 6.0 the script is gone.
Attached find the steps to get it working with CloudForms 4 and VSphere 6.
You can find the VDDK 6.0 here: https://developercenter.vmware.com/web/sdk/60/vddk
1 Copy the downloaded file VMware-vix-disklib-6.0.0-2498720.x86_64.tar.gz to /tmp on the appliance.
2. Untar the VMware-vix-disklib-6.0.0-2498720.x86_64.tar.gz
3. Create the directory /usr/lib/vmware-vix-disklib
4. Move the following directories and their contents into /usr/lib/vmware-vix-disklib:
bin64, include, lib64
5. Create symlinks to the libvixdiskLib so that introspection will work.
6. Load the libs