rubygem-xpath from home:Leen-Meyer:devel:languages:ruby:extensions project
Select Your Operating System
Add repository and install manually
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Leen-Meyer:devel:languages:ruby:extensions/15.6/home:Leen-Meyer:devel:languages:ruby:extensions.repo zypper refresh zypper install rubygem-xpath