+ifeq ($V,)
+ @echo 'Use "$(MAKE) V=1" to print test headings and PASSing results.'
+ @env NOTMUCH_TEST_QUIET=1 ${test_src_dir}/notmuch-test $(OPTIONS)
+else
+# The user has explicitly enabled quiet execution.
+ifeq ($V,0)
+ @env NOTMUCH_TEST_QUIET=1 ${test_src_dir}/notmuch-test $(OPTIONS)
+else