VirtualBox 4.2 install in Fedora 17

[root@localhost ~]$ su -
[root@localhost ~]$ # yum install gcc kernel-devel kernel-headers
[root@localhost ~]$ KERN_DIR=/usr/src/kernels/3.4.0-1.fc17.x86_64
[root@localhost ~]$ export KERN_DIR
[root@localhost ~]$ cd /etc/yum.repos.d/
[root@localhost ~]$ wget http://download.virtualbox.org/virtualbox/rpm/fedora/virtualbox.repo
[root@localhost ~]$  yum update
[root@localhost ~]$ rpm -qa kernel |sort |tail -n 1
[root@localhost ~]$ uname -r
[root@localhost ~]$ reboot
[root@localhost ~]$ yum install VirtualBox-4.2
[root@localhost ~]$ /etc/init.d/vboxdrv setup
[root@localhost ~]$ usermod -a -G vboxusers user_name
[root@localhost ~]$ VirtualBox