Problem with modules of VirtualBox?

Slackware comes with various kernels but only one source tree. Virtual Box (I use the closed source version, I suppose the same applies to the open source) does not like that - same situation if you have custom kernel and you erased the kernel sources. What to do?

cd /opt/VboxGuestAdditions-VERSION/src/vboxguest-VERSION

KERN_VER=`uname -r` KERN_DIR=/usr/src/linux/ make

KERN_VER=`uname -r` KERN_DIR=/usr/src/linux/ make install

Alternative

Download and extract the kernel in question. To find which kernel source you need to download use this command. uname -r. Virtualbox will search for kernel sources in /lib/modules/`uname -r`/build/.

ln -sf /usr/src/linux-`uname -r`/ /lib/modules/`uname -r`/build

cd to the kernel source tree and copy your current kernel configuration to .config (ex. from /boot)

make clean
make modules_prepare

In my system I have to unset ARCH. Probably you don't need this. unset ARCH

Now you can compile the Virtual Box modules in slackware /etc/rc.d/rc.vboxdrv setup
in 5.1.18 try
/sbin/vboxconfig
Maybe the equivelant on other systems cd /opt/VirtualBox/src/vboxhost; make; make install

Apr-2017: make oldconfig is useless. Remove.
Jul-2025: Alternative method. Wow almost 10 years passed.

Made in Linux :)

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