--- pjproject-2.5.5/build/rules.mak	2016-06-28 15:32:08.000000000 +0100
+++ rules.mak	2017-06-15 15:35:10.565758005 +0100
@@ -154,27 +154,27 @@
 ../lib/$(app).ko: $(LIB) $(OBJDIR)/$(app).ko
 	cp $(OBJDIR)/$(app).ko ../lib
 
-$(OBJDIR)/%$(OBJEXT): $(SRCDIR)/%.m
+$(OBJDIR)/%$(OBJEXT): $(SRCDIR)/%.m $(OBJDIRS)
 	$(CC) $($(APP)_CFLAGS) \
 		$(CC_OUT)$(subst /,$(HOST_PSEP),$@) \
 		$(subst /,$(HOST_PSEP),$<) 
 
-$(OBJDIR)/%$(OBJEXT): $(SRCDIR)/%.c
+$(OBJDIR)/%$(OBJEXT): $(SRCDIR)/%.c $(OBJDIRS)
 	$(CC) $($(APP)_CFLAGS) \
 		$(CC_OUT)$(subst /,$(HOST_PSEP),$@) \
 		$(subst /,$(HOST_PSEP),$<) 
 
-$(OBJDIR)/%$(OBJEXT): $(SRCDIR)/%.S
+$(OBJDIR)/%$(OBJEXT): $(SRCDIR)/%.S $(OBJDIRS)
 	$(CC) $($(APP)_CFLAGS) \
 		$(CC_OUT)$(subst /,$(HOST_PSEP),$@) \
 		$(subst /,$(HOST_PSEP),$<) 
 
-$(OBJDIR)/%$(OBJEXT): $(SRCDIR)/%.cpp
+$(OBJDIR)/%$(OBJEXT): $(SRCDIR)/%.cpp $(OBJDIRS)
 	$(CXX) $($(APP)_CXXFLAGS) \
 		$(CC_OUT)$(subst /,$(HOST_PSEP),$@) \
 		$(subst /,$(HOST_PSEP),$<)
 
-$(OBJDIR)/%$(OBJEXT): $(SRCDIR)/%.cc
+$(OBJDIR)/%$(OBJEXT): $(SRCDIR)/%.cc $(OBJDIRS)
 	$(CXX) $($(APP)_CXXFLAGS) \
 		$(CC_OUT)$(subst /,$(HOST_PSEP),$@) \
 		$(subst /,$(HOST_PSEP),$<)