Building Virtualbox guest additions on RHEL7 fails

Building the Oracle Virtualbox guest additions on the RHEL7 beta fail on the absence of the 'version.h' file [1]. This file would expected to be in the
kernel-headers package.

Anyone found a way to build/install the Virtualbox guest additions on the RHEL7 beta?

[1] /usr/src/kernels/3.10.0-54.0.1.el7.x86_64/include/linux/version.h

Steps to reproduce:
- yum install kernel-devel kernel-headers bzip2 make gcc -y
- run guest additions installer.
- check /var/log/vbox_addon.log

Rgrds, Martijn