Quote
process_begin: CreateProcess(NULL, python src/emu/cpu/mcs96/mcs96make.py mcs96 src/emu/cpu/mcs96/mcs96ops.lst obj/winui/
emu/cpu/mcs96/mcs96.inc, ...) failed.
make (e=2): The system cannot find the file specified.
make: *** [obj/winui/emu/cpu/mcs96/mcs96.inc] Error 2

It can be, your compiler doesn�t find the python folder to create ".inc" files.
Does it works if you compile the standard MESS (windows) version?
You make a clean compile?