Clean debug info directories generated by the linker at MacOS.

examples/Makefile.am

@@ -83,6 +83,9 @@ duration.$(OBJEXT): $(mo_kind_mod)
 iconatm.$(OBJEXT) \
 iconoce.$(OBJEXT): $(mo_event_manager_mod)
 
+clean-local:
+	rm -rf *.dSYM
+
 MOSTLYCLEANFILES = $(mo_event_manager_mod) $(mo_exception_mod) $(mo_example_mod) $(mo_kind_mod)
 
 mostlyclean-local:

test/Makefile.am

@@ -23,5 +23,8 @@ libmtime_check_la_SOURCES = \
     mtime_timedelta_test.c  \
     mtime_timedelta_test.h
 
+clean-local:
+	rm -rf *.dSYM
+
 MOSTLYCLEANFILES = $(EXTRA_LTLIBRARIES)