How can i remove the error when I try make -f makefile.unix for my own altcoin?

Question

I have done all the septs from this video(https://www.youtube.com/watch?v=mDGxGYvkDEE&list=PLHWfvuRy-9gdCv2oD_Ywd0swNF3N8mXt-&index=1&t=142s) but when i try ma