Our make(1) treats ./unit-tests and unit-tests as distinct targets.

Index: tests/Makefile.in
--- tests/Makefile.in.orig
+++ tests/Makefile.in
@@ -2158,7 +2158,7 @@ AM_CPPFLAGS = -I$(top_builddir)/lib -I$(top_srcdir)/li
 
 AM_CFLAGS = $(WERROR_CFLAGS) $(WARN_CFLAGS)
 CLEANFILES = *~ *.bak core core.[0-9]*
-TESTS = ./unit-tests$(EXEEXT) $(PX_TESTS)
+TESTS = unit-tests$(EXEEXT) $(PX_TESTS)
 TEST_EXTENSIONS = .px
 PX_LOG_COMPILER = $(PERL)
 AM_PX_LOG_FLAGS = -I$(srcdir)
@@ -2429,9 +2429,9 @@ recheck: all $(check_PROGRAMS)
 	        am__force_recheck=am--force-recheck \
 	        TEST_LOGS="$$log_list"; \
 	exit $$?
-./unit-tests.log: ./unit-tests$(EXEEXT)
-	@p='./unit-tests$(EXEEXT)'; \
-	b='./unit-tests'; \
+unit-tests.log: unit-tests$(EXEEXT)
+	@p='unit-tests$(EXEEXT)'; \
+	b='unit-tests'; \
 	$(am__check_pre) $(LOG_DRIVER) --test-name "$$f" \
 	--log-file $$b.log --trs-file $$b.trs \
 	$(am__common_driver_flags) $(AM_LOG_DRIVER_FLAGS) $(LOG_DRIVER_FLAGS) -- $(LOG_COMPILE) \