OK where would I need to change something that it works?
==> Generating module dependencies
==> Creating xz-compressed initcpio image: /boot/initramfs.img
==> Image generation successful
cp: cannot stat '/var/lib/manjaro-tools/buildiso/bspwm-mate/x86_64/bootfs/boot/amd-ucode.img': No such file or directory
==> ERROR: A failure occurred in make_image_boot().
--> overlayfs umount: [/var/lib/manjaro-tools/buildiso/bspwm-mate/x86_64/bootfs]
EDIT: Sure that bspwm-mate still can be build? @linux-aarhus It says on branch master, as well as on branch manjaro-architect:
This repository has been archived by the owner. It is now read-only.
(See also my error-message above I get when trying to build it. Cleaned the packages, but I can't build it anyway, since there's a problem with amd-ucode.img)