RedHat::VirtualBox guest additions error "unable to find the sources of your current Linux kernel"

I just cannot have an instance of Redhat (or anything, for that matter) running on VBox and NOT have guest additions installed!

Now, if you're doing it for the first time, chances are you'll come across this:

*** Error: unable to find the sources of your current Linux kernel. Specify KERN_DIR=<directory> and run Make again.  Stop.

Here's what you can do to fix it:

You need to install a few packages - you can do this by:

#yum update kernel-headers

this cmd will update your headers, if needed. You need to have a valid RedHat subscription for this to work. On other OSs like CentOS, it'll simply work.

Then, run this:

#yum install kernel*

this cmd will install something like four packages (depends on what you have and dont have already). Most important package in this list would be kernel-debug.

If you need to create a local repo or simply use the DVD, you can have a look at this - http://www.projectvnux.com/2013/09/creating-custom-repositories.html

Now, you can install the VBox Guest Additions - should work without errors.

Reboot. Enjoy fullscreen!

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