Running VirtualBox VM host on ReadyNAS Pro

Miniguide on installing/upgrading VirtualBox on RAIDiator 4.2.16.

Section 1 for new installations,

apt-get update
apt-get install build-essential amd64-libs lib64stdc++6 bzip2 lib64z1 lzma
apt-get --reinstall install libc6-amd64

Section 1 for upgrades,

apt-get update
apt-get -f install

Section 2 for both new installs and upgrades.

mkdir /c/VirtualBox
cd /c/VirtualBox
wget -q http://www.readynas.com/download/GPL/RNDP6xxx_4.2.16_WW_src.zip
unzip -q RNDP6xxx_4.2.16_WW_src.zip "linux-2.6.37.5/*"
ln -snf `pwd`/linux-2.6.37.5 /usr/src/linux
cd linux-2.6.37.5
cp arch/x86/configs/defconfig.smp .config
make ARCH=x86_64 silentoldconfig
make prepare
make modules_prepare
make
make modules

cd ..
wget -q http://download.virtualbox.org/virtualbox/4.0.4/VirtualBox-4.0.4-70112-Linux_amd64.run
wget -q http://download.virtualbox.org/virtualbox/4.0.4/Oracle_VM_VirtualBox_Extension_Pack-4.0.4-70112.vbox-extpack
chmod 755 VirtualBox-4.0.4-70112-Linux_amd64.run

Section 3, optional for upgraders, not relevant for new installs.
IF upgraders want to start clean with the install insert this command now to uninstall previous lingering VirtualBox components.

./VirtualBox-4.0.4-70112-Linux_amd64.run uninstall

Section 4, install.

./VirtualBox-4.0.4-70112-Linux_amd64.run
/usr/bin/VBoxManage extpack install Oracle_VM_VirtualBox_Extension_Pack-4.0.4-70112.vbox-extpack

Note that it's the extpack that contains the RDP module...

Instructions on how to install/create/configure/start VM's might be added later if needed.

Edit: Fixed wrong parameter on uninstall command.
Edit 2: Added two lines to create a work-directory, "VirtualBox" on your data volume "c" to avoid filling the root filesystem (when logging in as root the default directory is /root/ which resides on the small 4GB system partition).
Also added a few "extra" make commands after Sebastien and I found that they were needed on his ReadyNAS to successfully build the VBox kernel modules, I didn't need them but since they don't hurt in any way (just takes a tad bit longer to complete the kernel preparations) I include them in the guide as a precaution.