--- a/tests/test-fuzz-targets.t	Sun Jun 03 13:21:13 2018 +0900
+++ b/tests/test-fuzz-targets.t	Sun Jun 03 13:23:12 2018 +0900
@@ -1,6 +1,6 @@
 #require clang-libfuzzer test-repo
   $ cd $TESTDIR/../contrib/fuzz
-  $ make
+  $ make -s clean all
 Just run the fuzzers for five seconds each to verify it works at all.
   $ ./bdiff -max_total_time 5
   $ ./xdiff -max_total_time 5