create symlinks in /lib/modules/KERNELVERSION/
tar xvf linux-KERNELVERSION-patched.txz
cd linux-KERNELVERSION
ln -sf "location of linux-KERNELVERSION" to /usr/src/linux
ln -sf /lib/modules/KERNELVERSION-tinycore/build /usr/src/linux
ln -sf /lib/modules/KERNELVERSION-tinycore/source /usr/src/linux

cp../config-KERNELVERSION-tinycore-mountdevtmpfs linux-KERNELVERSION/.config
cd /usr/src/linux
make oldconfig
make prepare
make modules_prepare

Run the virtualbox*.run file