Hey,
It seems like the VDDK 6.7 releases were built wrong. When trying to use it with openSUSE Leap 42.3 (SLE 12 SP3) and CentOS 7 (RHEL 7), I get errors using the code due to missing libraries.
I ran "ldd" on some of the provided libraries, and I noticed that "libvixDiskLib.so.6.7.0" (among others) links to a lot more libraries than older versions did, including OpenSSL 1.1, which is not available on these distributions.
It seems like VDDK 6.7 needs to be rebuilt on Leap 42.3/SLE 12SP3 or CentOS/RHEL 7 so that it'll work properly.