Hey there :)
Haven't built this in a while, so I tried picking out the most recently active branch, rightly or wrongly :) So I picked "newpixel", and got reasonably far into the build but then got this:
Starting DRC Task
ERROR: [DRC MDRV-1] Multiple Driver Nets: Net machine0/cpu0/cartridge_enable has multiple drivers: machine0/cpu0/cartridge_enable_reg/Q, and machine0/cpu0/cartridge_enable_reg__0/Q.
Haven't had a chance to figure this out, but thought I'd drop a note here anyway :)
Gurce