SELFTEST_NOSLOW_OPTS = --exclude=$(srcdir)/selftest/slow
SELFTEST_QUICK_OPTS = $(SELFTEST_NOSLOW_OPTS) --quick --include=$(srcdir)/selftest/quick
-FILTER_XFAIL = $(PYTHON) $(selftestdir)/filter-subunit --expected-failures=$(srcdir)/selftest/knownfail
-SUBUNIT_FORMATTER ?= $(PYTHON) $(selftestdir)/format-subunit --prefix=${selftest_prefix} --immediate
+FILTER_XFAIL = $(PYTHON) -u $(selftestdir)/filter-subunit --expected-failures=$(srcdir)/selftest/knownfail
+SUBUNIT_FORMATTER ?= $(PYTHON) -u $(selftestdir)/format-subunit --prefix=${selftest_prefix} --immediate
FORMAT_TEST_OUTPUT = $(FILTER_XFAIL) | $(SUBUNIT_FORMATTER)
test-subunit:: everything