Kerkerkruip consists of a minimal source file and a large set of extensions. I have also added two extensions by other people which I have edited for my own purposes. This is, of course, very unclean, and I will attempt to do better in later releases. But I think you should be able to get the current code to compile. (You do need to download several additional extensions from the I7 website.)

My code if all under the GPL version 3 or any later version. Extensions by others are copyrighted by their respective authors, and may be released under different licenses.