obj-y := cpu.o os.o start.o state.o
# os.c is build in the system environment, so needs standard includes
-$(obj)os.o: ALL_CFLAGS := $(filter-out -nostdinc,$(ALL_CFLAGS))
-$(obj).depend.os: CPPFLAGS := $(filter-out -nostdinc,$(CPPFLAGS))
+$(obj)os.o: CFLAGS := $(filter-out -nostdinc,\
+ $(patsubst -I%,-idirafter%,$(CFLAGS)))
+$(obj).depend.os: CPPFLAGS := $(filter-out -nostdinc,\
+ $(patsubst -I%,-idirafter%,$(CPPFLAGS)))