This home repository is kind of broken and shouldn’t be used. The home repo does not build a working package for Leap. It is not possible to build and use the latest KiCAD 8.0.x version on Leap 15.5 or Leap 15.6.
Gzunder:~ # zypper update glibc
Loading repository data...
Reading installed packages...
No update candidate for 'glibc-2.31-150300.86.3.x86_64'. The highest available version is already installed.
Resolving package dependencies...
Nothing to do.
Gzunder:~ #
FlatPak is a software distribution system that allows us to provide up-to-date versions of KiCad on many Linux distributions. FlatPak is officially supported by KiCad and is our recommended way to install the latest version of KiCad on any distribution other than Ubuntu and Fedora, if it is not available through your distribution’s package manager.
Also
Upgrading glibc requires recompiling all packages.
It is possible to use newer glibc on Leap with LD_PRELOAD or LD_LIBRARY_PATH prefixes.