Index: VirtualBox-6.0.14/src/VBox/HostDrivers/linux/Makefile
===================================================================
--- VirtualBox-6.0.14.orig/src/VBox/HostDrivers/linux/Makefile
+++ VirtualBox-6.0.14/src/VBox/HostDrivers/linux/Makefile
@@ -45,6 +45,8 @@ else # ! KERNELRELEASE
 
 KBUILD_VERBOSE ?=
 KERN_VER ?= $(shell uname -r)
+PWD ?= $(shell pwd)
+
 .PHONY: all install clean check unload load vboxdrv vboxnetflt vboxnetadp \
     vboxpci
 
@@ -64,6 +66,7 @@ vboxnetflt: vboxdrv
 	    if [ -f vboxdrv/Module.symvers ]; then \
 	        cp vboxdrv/Module.symvers vboxnetflt; \
 	    fi; \
+	    export KBUILD_EXTRA_SYMBOLS=${PWD}/vboxnetflt/Module.symvers; \
 	    echo "=== Building 'vboxnetflt' module ==="; \
 	    $(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) -C vboxnetflt || exit 1; \
 	    cp vboxnetflt/vboxnetflt.ko .; \
@@ -75,8 +78,9 @@ vboxnetadp: vboxdrv
 	    if [ -f vboxdrv/Module.symvers ]; then \
 	        cp vboxdrv/Module.symvers vboxnetadp; \
 	    fi; \
+	    export KBUILD_EXTRA_SYMBOLS=${PWD}/vboxnetadp/Module.symvers; \
 	    echo "=== Building 'vboxnetadp' module ==="; \
-	    $(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) -C vboxnetadp || exit 1; \
+            $(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) -C vboxnetadp || exit 1; \
 	    cp vboxnetadp/vboxnetadp.ko .; \
 	    echo; \
 	fi
@@ -86,6 +90,7 @@ vboxpci: vboxdrv
 	    if [ -f vboxdrv/Module.symvers ]; then \
 	        cp vboxdrv/Module.symvers vboxpci; \
 	    fi; \
+	    export KBUILD_EXTRA_SYMBOLS=${PWD}/vboxpci/Module.symvers; \
 	    echo "=== Building 'vboxpci' module ==="; \
 	    $(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) -C vboxpci || exit 1; \
 	    cp vboxpci/vboxpci.ko .; \
@@ -95,12 +100,15 @@ vboxpci: vboxdrv
 install:
 	@$(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) -C vboxdrv install
 	@if [ -d vboxnetflt ]; then \
+	    export KBUILD_EXTRA_SYMBOLS=${PWD}/vboxnetflt/Module.symvers; \
 	    $(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) -C vboxnetflt install; \
 	fi
 	@if [ -d vboxnetadp ]; then \
+	    export KBUILD_EXTRA_SYMBOLS=${PWD}/vboxnetadp/Module.symvers; \
 	    $(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) -C vboxnetadp install; \
 	fi
 	@if [ -d vboxpci ]; then \
+	    export KBUILD_EXTRA_SYMBOLS=${PWD}/vboxpci/Module.symvers; \
 	    $(MAKE) KBUILD_VERBOSE=$(KBUILD_VERBOSE) -C vboxpci install; \
 	fi