@tenk.wang
It built fine now , I used -j4 option.
Thanks for all the support !.
Now for flashing can you please point me to the correct link.
I am following this post f yours : How to flash vim3 with android 11 - #23 by Vladimir.v.v
as per this , uboot and flash.img are the only thing.
Is it correct !
Thanks and Regards,
R