diff --git a/config.lib b/config.lib
--- a/config.lib
+++ b/config.lib
@@ -1012,6 +1012,12 @@ check_params() {
 
 	if [ -d "$ROOT_DIR/.svn" ] && [ -n "`svn help 2>/dev/null`" ]; then
 		log 1 "checking revision... svn detection"
+	elif [ -d "$ROOT_DIR/../.svn" ] && [ -n "`svn help 2>/dev/null`" ] && [ -n "`LC_ALL=C svn info $ROOT_DIR/.. | grep '^URL:.*tags$'`" ]; then
+		# subversion changed its behaviour; now not all folders have a .svn folder,
+		# but only the root folder. Since making tags requires a (sparse) checkout
+		# of the tags folder, the folder of the tag does not have a .svn folder
+		# anymore and this fails to detect the subversion repository checkout.
+		log 1 "checking revision... svn detection (tag)"
 	elif [ -d "$ROOT_DIR/.git" ] && [ -n "`git help 2>/dev/null`" ]; then
 		log 1 "checking revision... git detection"
 	elif [ -d "$ROOT_DIR/.hg" ] && [ -n "`hg help 2>/dev/null`" ]; then