Thanks to info from zezaocapoeira, there is a patch – from efferre79 – for VMware vmmon to fix the compile problem with kernel 4.3..

https://github.com/efferre79/vmware/blob/master/app-emulation/vmware-modules/files/308-4.03-00-misc_deregister.patch

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