vagrant up doesn't work

[langston-barrett]

==> default: 2016-06-28 06:26:40 (2.35 MB/s) - ‘VBoxGuestAdditions_5.0.6.iso’ saved [58966016/58966016]
==> default: Verifying archive integrity...
==> default:  All good.
==> default: Uncompressing VirtualBox 5.0.6 Guest Additions for Linux
==> default: ....
==> default: ..
==> default: .
==> default: .
==> default: ....
==> default: VirtualBox Guest Additions installer
==> default: Copying additional installer modules ...
==> default: Installing additional modules ...
==> default: Removing existing VirtualBox non-DKMS kernel modules
==> default: [  OK  ]
==> default: Building the VirtualBox Guest Additions kernel modules
==> default: 
==> default: The headers for the current running kernel were not found. If the following
==> default: module compilation fails then this could be the reason.
==> default: The missing package can be probably installed with
==> default: yum install kernel-devel-3.10.0-327.4.5.el7.x86_64
==> default: 
==> default: Building the main Guest Additions module
==> default: [FAILED]
==> default: (Look at /var/log/vboxadd-install.log to find out what went wrong)
==> default: Doing non-kernel setup of the Guest Additions
==> default: [  OK  ]
==> default: Installing the Window System drivers
==> default: 
==> default: Could not find the X.Org or XFree86 Window System, skipping.

That log has this message:

** Compiling vboxdrv
Makefile:152: *** Error: unable to find the sources of your current Linux kernel. Specify KERN_DIR=<directory> and run Make again. Stop.