Hi. The attached patch works for me. (the file is not in the original source and it's created as new, therefore I guess it belongs to the first section of debian/clean, before the comment).
Would you please check if it fixes the current issue? (I would prefer not to report new bugs for now). Thanks.
--- a/debian/clean +++ b/debian/clean @@ -1,6 +1,7 @@ BUILD/ subversion/bindings/swig/ruby/test/.test-result/ subversion/po/subversion.pot +subversion/tests/cmdline/.davautocheck.sh.stop # These get regenerated and vary slightly from original source, so need to be removed subversion/libsvn_client/libsvn_client.pc.in subversion/libsvn_ra/libsvn_ra.pc.in

