--- linux-4.1/scripts/Makefile.headersinst
+++ linux-4.1/scripts/Makefile.headersinst
@@ -11,7 +11,7 @@
 gen := $(if $(gen),$(gen),$(subst include/,include/generated/,$(obj)))
 
 kbuild-file := $(srctree)/$(obj)/Kbuild
-include $(kbuild-file)
+-include $(kbuild-file)
 
 # called may set destination dir (when installing to asm/)
 _dst := $(if $(destination-y),$(destination-y),$(if $(dst),$(dst),$(obj)))