warning instead of error if ub_tools is built without tuefind installation
warning instead of error if ub_tools is built without tuefind installation

ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools