diff -ur source/ltrace-0.5_77.orig/Makefile source/ltrace-0.5_77/Makefile
--- Makefile.in
+++ Makefile.in
@@ -37,7 +37,9 @@
 ltrace:		sysdeps/sysdep.o $(OBJ)
 		$(CC) $(LDFLAGS) $^ $(LIBS) -o $@
 
-sysdeps/sysdep.o: dummy
+$(OBJ):		sysdeps/$(OS)/sysdep.h sysdeps/$(OS)/signalent.h sysdeps/$(OS)/syscallent.h
+sysdeps/sysdep.o sysdeps/$(OS)/sysdep.h sysdeps/$(OS)/signalent.h sysdeps/$(OS)/syscallent.h: dummy
+dummy:
 		$(MAKE) -C sysdeps/$(OS)
 
 clean-deja: