Thank you bungcip, now it compiled without error. but.. when I run make qemu, qemu runs up to a message "no bootable device."
I'm just going to document my progress here (if that's ok) in the hope that it might help others..
I don't see a .iso file after "make all".
In the "build" folder I have filesystem.bin and hardrive.bin.
So, I ran "make iso" and it compiled up to error of missing "isohybrid" command.
It did create "livedisk.bin" successfully in the "build" folder, which ran in qemu with Vesa video card.
I was able to put it on a usb drive and it loaded sucessfully on my laptop.
So the moral of the story thus far is, the "make iso" command built "redox/build/livedisk.bin" which you can use in vm, burn and boot from.