Для openSUSE Factory запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/editors:tree-sitter/openSUSE_Factory/editors:tree-sitter.repo
zypper refresh
zypper install tree-sitter-kdl
Для 16.0 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/editors:tree-sitter/16.0/editors:tree-sitter.repo
zypper refresh
zypper install tree-sitter-kdl
Для 15.6 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/editors:tree-sitter/15.6/editors:tree-sitter.repo
zypper refresh
zypper install tree-sitter-kdl