rpm-build has a dependency on the zip package for no reason I can see, and it lacks a dependency on unzip which is used in a few places. Additionally, a dependency on lzma would be consistent with gzip, bzip2 and unzip so that %setup can extract lzma archives without additional BuildRequires. Specfile patch attached, will also include a related (upstream) patch to INSTALL.
Created attachment 310694 [details] Fix zip->unzip dependency, add lzma
Created attachment 310696 [details] Decompressor clarifications to INSTALL
In upstream + rawhide now, thanks.