systemd-rpm-macros from home:smarty12:libraries project
Select Your Operating System
Add repository and install manually
For openSUSE Leap 15.3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:smarty12:libraries/openSUSE_Leap_15.3/home:smarty12:libraries.repo zypper refresh zypper install systemd-rpm-macros