When building Fedora based Linux devkits, rpm packages are downloaded from locations at the Fedora project. The latest/active versions reside under https://dl.fedoraproject.org while older, archived versions live at https://archives.fedoraproject.org.

It seems more releases have been archived in the meanwhile, so e.g. a build based on Fedora 27, which is currently marked as default, would fail.

The make file has to be adapted to cater for the newer releases.