Build failed configure of px4-v2 using on Copter-3.6.8

I actually followed all the steps mentioned above. The problem is, I can build use configure of fmuv3, which is using the ChibiOS. But if I configure as px4-v2 using nuttx, it would display like :No rule to make target ‘msg_gen’…blablabla.
So, is the lastest branch can’t totally support the nuttx OS?

May I ask you for help?@rmackay9
I remember that you taught me how to build in windous using waf.