Thanks to info from zezaocapoeira, there is a patch – from efferre79 – for VMware vmmon to fix the compile problem with kernel 4.3..
I have tested the vmmon part of this with Workstation 12 and Kernel 4.3-rc5, and everything now compiles and loads/runs OK..
VMware vmci for Workstation 12 is now included with the standard kernel code..
Robert Gadsdon. October 18, 2015