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--- a/src/vboxhost/Makefile
+++ b/src/vboxhost/Makefile
@@ -33,25 +33,25 @@
# SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
#
-ifneq ($(KERNELRELEASE),)
+ifneq ($(KBUILD_EXTMOD),)
-# Building from kBuild (make -C <kernel_directory> M=`pwd`),
-# or inside a kernel source tree.
+# Building from kBuild (make -C <kernel_directory> M=`pwd`).
+# KBUILD_EXTMOD is set to $(M) in this case.
obj-m = vboxdrv/
- ifneq ($(wildcard $(CURDIR)/vboxnetflt/Makefile),)
+ ifneq ($(wildcard $(KBUILD_EXTMOD)/vboxnetflt/Makefile),)
obj-m += vboxnetflt/
endif
- ifneq ($(wildcard $(CURDIR)/vboxnetadp/Makefile),)
+ ifneq ($(wildcard $(KBUILD_EXTMOD)/vboxnetadp/Makefile),)
obj-m += vboxnetadp/
endif
- ifneq ($(wildcard $(CURDIR)/vboxpci/Makefile),)
+ ifneq ($(wildcard $(KBUILD_EXTMOD)/vboxpci/Makefile),)
obj-m += vboxpci/
endif
-else # ! KERNELRELEASE
+else # ! KBUILD_EXTMOD
-# convenience Makefile without KERNELRELEASE
+# convenience Makefile without KBUILD_EXTMOD
ifndef SUDO
ifneq ($(shell id -u),0)
@@ -244,5 +244,5 @@ load: unload
fi; \
done
-endif # ! KERNELRELEASE
+endif # ! KBUILD_EXTMOD
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