build system: fix build in separate obj tree
diff --git a/Makefile b/Makefile
index 5117c45..077f5ab 100644
--- a/Makefile
+++ b/Makefile
@@ -399,6 +399,7 @@
 export KBUILD_DEFCONFIG
 
 config %config: scripts_basic outputmakefile FORCE
+	$(Q)mkdir -p include
 	$(Q)$(MAKE) $(build)=scripts/kconfig $@
 	$(Q)$(MAKE) -C $(srctree) KBUILD_SRC= .kernelrelease