After a lot of hours/days trying to compile here are my results so far~
the only time the compiling seems to work properly was after I issued:
1>> git clone --recurse-submodules https://github.com/MEGA65/mega65-core.git
2>> git checkout master
3>> make (make bin/test.bit does not work)
after about 18minutes! compiling time I got stuck in message (for ages): Start Technology Mapping....
(VM Ubuntu 18.04 64bit / Vivado 2017.4)
Here is Vivado.log file
PS:Noticed that start compiling for mega65r1 how can I change to Nexys4DDR?