root@mowa219-gjp4-8570p-freebsd:~ # /usr/src/tools/build/beinstall.sh KERNCONF=GENERIC-NODEBUG
error: Must be in FreeBSD source tree
root@mowa219-gjp4-8570p-freebsd:~ # cd /usr/src
root@mowa219-gjp4-8570p-freebsd:/usr/src # /usr/src/tools/build/beinstall.sh KERNCONF=GENERIC-NODEBUG
Successfully mounted 14.0-CURRENT-20220409.165943 at /tmp/beinstall.wdL42J/mnt
Mounted 14.0-CURRENT-20220409.165943 to /tmp/beinstall.wdL42J/mnt, performing install/update ...
--------------------------------------------------------------
>>> Install check kernel
--------------------------------------------------------------
--------------------------------------------------------------
>>> Installing kernel GENERIC-NODEBUG on Sun Apr 10 16:53:20 BST 2022
--------------------------------------------------------------
…
===> Building for virtualbox-ose-kmod-6.1.32_1
cd /tmp/mountpoint.kVhX2N/emulators/virtualbox-ose-kmod/work/VirtualBox-6.1.32/src/VBox/HostDrivers && /bin/sh -c '. /tmp/mountpoint.kVhX2N/emulators/virtualbox-ose-kmod/work/VirtualBox-6.1.32/env.sh && VBOX_LIBPATH_X11=/usr/local VBOX_FREEBSD_SRC=/usr/src/sys /usr/local/bin/kmk HostDrivers-scripts vboxdrv-src VBoxNetFlt-src VBoxNetAdp-src'
Makefile.kmk:28: /tmp/mountpoint.EPGdT8/emulators/virtualbox-ose-kmod/work/VirtualBox-6.1.32/kBuild/subheader.kmk: No such file or directory
Makefile.kmk:31: /Support/Makefile.kmk: No such file or directory
kmk: *** No rule to make target `/Support/Makefile.kmk'. Stop.
*** Error code 2
Stop.
make[2]: stopped in /tmp/mountpoint.kVhX2N/emulators/virtualbox-ose-kmod
*** Error code 1
Stop.
make[1]: stopped in /tmp/mountpoint.kVhX2N/emulators/virtualbox-ose-kmod
*** Error code 1
Stop.
make: stopped in /tmp/mountpoint.kVhX2N/emulators/virtualbox-ose-kmod
===> Chrooted make in /tmp/beinstall.wdL42J/mnt failed
===> Cleaning up...
*** Error code 1
Stop.
make[3]: stopped in /usr/ports/emulators/virtualbox-ose-kmod
*** Error code 1
Stop.
make[2]: stopped in /usr/obj/usr/src/amd64.amd64/sys/GENERIC-NODEBUG
*** Error code 1
Stop.
make[1]: stopped in /usr/src
*** Error code 1
Stop.
make: stopped in /usr/src
Cleaning up ...
umount -f /tmp/beinstall.wdL42J/mnt
error: Installkernel failed!
root@mowa219-gjp4-8570p-freebsd:/usr/src #