KERNEL_ARCH_CHANGED := $(if $(filter 0,$(shell grep -s ^$(if $(filter x86,$(TARGET_KERNEL_ARCH)),\#.)CONFIG_64BIT $(KERNEL_DOTCONFIG_FILE) | wc -l)),FORCE)
$(KERNEL_DOTCONFIG_FILE): $(KERNEL_CONFIG_FILE) $(wildcard $(TARGET_KERNEL_DIFFCONFIG)) $(KERNEL_ARCH_CHANGED)
$(hide) mkdir -p $(@D) && cat $(wildcard $^) > $@
+ $(hide) ln -sf ../../../../../../external $(@D)
$(mk_kernel) oldnoconfig
# bison is needed to build kernel and external modules from source