You should be able to do a full build now if you comment out:
if [ -z "$secondaryArchSuffix" ]; then
pythonModuleEnabled=true
fi
in haikuports/dev-libs/libxml2/libxml2-2.9.12.recipe
Then with the efi.sh drive part changed to:
-drive file=fat:rw:disk,format=raw \
-drive file=haiku-bootstrap.image
You should get the same kind of log in console.