Ok, not quite as far as I can go. After applying libserf-1-1-1.3.10-1.5.x86_64.rpm from Tumbleweed repo (and it's dependencies - libgdbm6-1.23-3.3.x86_64.rpm, libldap2-2.6.7-2.1.x86_64.rpm), subversion is now working for me.