I wanted to mention this in case it helps others trying to compile Qubes.
Issue 1
I got lots of issues when trying to do qubes-builder at first. I figured out it was because I was trying to build
Qubes 4.1 which is not stable build processes. I recommend buliding Qubes 4.0 for less compile issues.
Issue 2
Error: "ln: failed to access 'pkgs/vm-fc29/noarch/grubby-dummy-9.0.0-1.noarch.rpm': No such file or directory
This error came up when I was trying to compile with "make qubes". I think the issue is make compiles at least
one thing out of order. I used the command "make grubby-dummy" to build grubby-dummy. Then I was able to
continue compiling as normal (you can type "make help" to list all the components that make builds,
then list starting with where you left off at so you do not have to recompile the entire source tree. I.E. .
"linux-gbulb linux-scrypt linux-template-builder installer-qubes-os ......."
Issue 3
Qubes-Builder will fail if you do not have a local Tor processes running.
chroot-vm-stretch uses some Tor hidden services links for apt to get software.
I solved this by compiling tor and running on my OS that I'm also running qubes-builder on.