diff --git a/rbutil/libtools.make b/rbutil/libtools.make
index 59be99f76b..2e3cc6f1e2 100644
--- a/rbutil/libtools.make
+++ b/rbutil/libtools.make
@@ -80,6 +80,8 @@ all: $(BINARY)
 OBJS := $(patsubst %.c,%.o,$(addprefix $(OBJDIR),$(notdir $(SOURCES))))
 LIBOBJS := $(patsubst %.c,%.o,$(addprefix $(OBJDIR),$(notdir $(LIBSOURCES))))
 
+$(foreach src,$(SOURCES) $(LIBSOURCES),$(eval $(addprefix $(OBJDIR),$(subst .c,.o,$(notdir $(src)))): $(src)))
+
 # additional link dependencies for the standalone executable
 # extra dependencies: libucl
 LIBUCL = libucl$(RBARCH).a
@@ -98,7 +100,7 @@ $(BINARY): $(OBJS) $(EXTRADEPS) $(addprefix $(OBJDIR),$(EXTRALIBOBJS))
 	    $(addprefix $(OBJDIR),$(EXTRALIBOBJS))
 
 # common rules
-$(OBJDIR)%.o: %.c
+$(OBJDIR)%.o:
 	@echo CC $<
 	$(SILENT)mkdir -p $(dir $@)
 	$(SILENT)$(CROSS)$(CC) $(CFLAGS) -c -o $@ $<
diff --git a/rbutil/mkimxboot/Makefile b/rbutil/mkimxboot/Makefile
index a81b960649..acfe8de6bb 100644
--- a/rbutil/mkimxboot/Makefile
+++ b/rbutil/mkimxboot/Makefile
@@ -27,7 +27,3 @@ include ../libtools.make
 $(OBJDIR)mkimxboot.o: dualboot.h dualboot.c mkimxboot.c mkimxboot.h
 $(OBJDIR)main.o: dualboot.h dualboot.c main.c mkimxboot.h
 
-$(OBJDIR)%.o: $(IMXTOOLS_DIR)%.c
-	@echo CC $<
-	$(SILENT)mkdir -p $(dir $@)
-	$(SILENT)$(CROSS)$(CC) $(CFLAGS) -c -o $@ $<
diff --git a/rbutil/mktccboot/Makefile b/rbutil/mktccboot/Makefile
index 31ad68e643..df49c6977d 100644
--- a/rbutil/mktccboot/Makefile
+++ b/rbutil/mktccboot/Makefile
@@ -25,9 +25,4 @@ include ../libtools.make
 # Rules go _after_ including mkboot.make to have OBJDIR set up correctly.
 # Paths are assumed to end with a /
 telechips.o: $(OBJDIR)telechips.o
-$(OBJDIR)%.o: $(TOOLSDIR)%.c
-	@echo CC $<
-	$(SILENT)mkdir -p $(dir $@)
-	$(SILENT)$(CROSS)$(CC) $(CFLAGS) -c -o $@ $<
-