diff --git a/config.mk b/config.mk
index 07afb35..b08be7a 100644
--- a/config.mk
+++ b/config.mk
@@ -318,38 +318,3 @@ endif
 export	HOSTCC HOSTCFLAGS HOSTLDFLAGS CROSS_COMPILE \
 	AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP MAKE
 export	CONFIG_SYS_TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS
-
-#########################################################################
-
-# Allow boards to use custom optimize flags on a per dir/file basis
-ALL_AFLAGS = $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR))
-ALL_CFLAGS = $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR))
-EXTRA_CPPFLAGS = $(CPPFLAGS_$(BCURDIR)/$(@F)) $(CPPFLAGS_$(BCURDIR))
-ALL_CFLAGS += $(EXTRA_CPPFLAGS)
-
-# The _DEP version uses the $< file target (for dependency generation)
-# See rules.mk
-EXTRA_CPPFLAGS_DEP = $(CPPFLAGS_$(BCURDIR)/$(addsuffix .o,$(basename $<))) \
-		$(CPPFLAGS_$(BCURDIR))
-$(obj)%.s:	%.S
-	$(CPP) $(ALL_AFLAGS) -o $@ $<
-$(obj)%.o:	%.S
-	$(CC)  $(ALL_AFLAGS) -o $@ $< -c
-$(obj)%.o:	%.c
-ifneq ($(CHECKSRC),0)
-	$(CHECK) $(CHECKFLAGS) $(ALL_CFLAGS) $<
-endif
-	$(CC)  $(ALL_CFLAGS) -o $@ $< -c
-$(obj)%.i:	%.c
-	$(CPP) $(ALL_CFLAGS) -o $@ $< -c
-$(obj)%.s:	%.c
-	$(CC)  $(ALL_CFLAGS) -o $@ $< -c -S
-
-#########################################################################
-
-# If the list of objects to link is empty, just create an empty built-in.o
-cmd_link_o_target = $(if $(strip $1),\
-		      $(LD) $(LDFLAGS) -r -o $@ $1,\
-		      rm -f $@; $(AR) rcs $@ )
-
-#########################################################################
diff --git a/examples/api/Makefile b/examples/api/Makefile
index f770859..52f4368 100644
--- a/examples/api/Makefile
+++ b/examples/api/Makefile
@@ -50,9 +50,9 @@ $(obj)demo.bin: $(obj)demo
 		$(OBJCOPY) -O binary $< $@ 2>/dev/null
 
 # Rule to build generic library C files
-$(obj)%.o: $(SRCTREE)/lib/%.c
+$(addprefix $(obj),$(notdir $(EXT_COBJ_FILES-y))): $(obj)%.o: $(SRCTREE)/lib/%.c
 	$(CC) -g $(CFLAGS) -c -o $@ $<
 
 # Rule to build architecture-specific library assembly files
-$(obj)%.o: $(SRCTREE)/arch/$(ARCH)/lib/%.S
+$(addprefix $(obj),$(notdir $(EXT_SOBJ_FILES-y))): $(obj)%.o: $(SRCTREE)/arch/$(ARCH)/lib/%.S
 	$(CC) -g $(CFLAGS) -c -o $@ $<
diff --git a/post/lib_powerpc/fpu/Makefile b/post/lib_powerpc/fpu/Makefile
index ae56a82..a7aa5bc 100644
--- a/post/lib_powerpc/fpu/Makefile
+++ b/post/lib_powerpc/fpu/Makefile
@@ -18,7 +18,7 @@ obj-y	+= darwin-ldouble.o
 CFLAGS := $(shell echo $(CFLAGS) | sed s/-msoft-float//)
 CFLAGS += -mhard-float -fkeep-inline-functions
 
-$(obj)%.o:	%.c
+$(addprefix $(obj),$(obj-y)): $(obj)%.o:	%.c
 	$(CC)  $(ALL_CFLAGS) -o $@.fp $< -c
 	$(OBJCOPY) -R .gnu.attributes $@.fp $@
 	rm -f $@.fp
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 50c0394..1b3d77f 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -67,6 +67,37 @@ endif
 
 #########################################################################
 
+# Allow boards to use custom optimize flags on a per dir/file basis
+ALL_AFLAGS = $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR))
+ALL_CFLAGS = $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR))
+EXTRA_CPPFLAGS = $(CPPFLAGS_$(BCURDIR)/$(@F)) $(CPPFLAGS_$(BCURDIR))
+ALL_CFLAGS += $(EXTRA_CPPFLAGS)
+
+# The _DEP version uses the $< file target (for dependency generation)
+# See rules.mk
+EXTRA_CPPFLAGS_DEP = $(CPPFLAGS_$(BCURDIR)/$(addsuffix .o,$(basename $<))) \
+		$(CPPFLAGS_$(BCURDIR))
+$(obj)%.s:	%.S
+	$(CPP) $(ALL_AFLAGS) -o $@ $<
+$(obj)%.o:	%.S
+	$(CC)  $(ALL_AFLAGS) -o $@ $< -c
+$(obj)%.o:	%.c
+ifneq ($(CHECKSRC),0)
+	$(CHECK) $(CHECKFLAGS) $(ALL_CFLAGS) $<
+endif
+	$(CC)  $(ALL_CFLAGS) -o $@ $< -c
+$(obj)%.i:	%.c
+	$(CPP) $(ALL_CFLAGS) -o $@ $< -c
+$(obj)%.s:	%.c
+	$(CC)  $(ALL_CFLAGS) -o $@ $< -c -S
+
+# If the list of objects to link is empty, just create an empty built-in.o
+cmd_link_o_target = $(if $(strip $1),\
+		      $(LD) $(LDFLAGS) -r -o $@ $1,\
+		      rm -f $@; $(AR) rcs $@ )
+
+#########################################################################
+
 # defines $(obj).depend target
 
 include $(TOPDIR)/rules.mk