The problem is with this line:
CFLAGS="-march=native -mtune=native" make
Remove the -march=native part to make it
CFLAGS="-mtune=native" make
and you're golden. Worked for me anyway. Good luck!
That worked! Thanks a ton. Now, do you mind sharing what command I'd run to see the results of my mining, for example to see what my current kHash/s is?