Guest additions do not install?

I'm having some issues getting the box to work.

(Windows 7 running Vagrant 1.5.4 VirtualBox 4.3.10)

It seems the guest additions can not be installed?

vagrant reload
==> default: Attempting graceful shutdown of VM...
==> default: Checking if box 'mitchellh/boot2docker' is up to date...
==> default: Clearing any previously set forwarded ports...
==> default: Clearing any previously set network interfaces...
==> default: Preparing network interfaces based on configuration...
    default: Adapter 1: nat
==> default: Forwarding ports...
    default: 4243 => 4243 (adapter 1)
    default: 22 => 2222 (adapter 1)
==> default: Running 'pre-boot' VM customizations...
==> default: Booting VM...
==> default: Waiting for machine to boot. This may take a few minutes...
    default: SSH address: 127.0.0.1:2222
    default: SSH username: docker
    default: SSH auth method: private key
    default: Warning: Connection timeout. Retrying...
    default: Warning: Remote connection disconnect. Retrying...
==> default: Machine booted and ready!
No installation found.
The guest's platform is currently not supported, will try generic Linux method..
.
Copy iso file C:\Program Files\Oracle\VirtualBox\VBoxGuestAdditions.iso into the
 box /tmp/VBoxGuestAdditions.iso
boot2docker: 0.8.0
Installing Virtualbox Guest Additions 4.3.10 - guest version is
boot2docker: 0.8.0
mkdir: can't create directory '/tmp/selfgz69713780': No such file or directory
Cannot create target directory /tmp/selfgz69713780
You should try option --target OtherDirectory
An error occurred during installation of VirtualBox Guest Additions 4.3.10. Some
 functionality may not work as intended.
In most cases it is OK that the "Window System drivers" installation failed.
boot2docker: 0.8.0
boot2docker: 0.8.0
rm: remove '/tmp/VBoxGuestAdditions.iso'?

My synced folders from the Vagrantfile are not mounted afterwards...

mitchellh / boot2docker-vagrant-box

Guest additions do not install? #40