Building the main Guest Additions module [failed] のエラー

centOS6.6 64bitでVirtualBox Guest Additionsを入れようとしたとき以下のエラーが発生

[root@localhost cdrom]# sh ./VBoxLinuxAdditions.run
Verifying archive integrity... All good.
Uncompressing VirtualBox 5.0.8 Guest Additions for Linux............
VirtualBox Guest Additions installer
Removing installed version 5.0.8 of VirtualBox Guest Additions...
Stopping VirtualBox Additions                              [  OK  ]
Removing existing VirtualBox non-DKMS kernel modules       [  OK  ]
Copying additional installer modules ...
Installing additional modules ...
Removing existing VirtualBox non-DKMS kernel modules       [  OK  ]
Building the VirtualBox Guest Additions kernel modules
Building the main Guest Additions module                   [失敗]
(Look at /var/log/vboxadd-install.log to find out what went wrong)
Doing non-kernel setup of the Guest Additions              [  OK  ]
Installing the Window System drivers
Could not find the X.Org or XFree86 Window System, skipping.

/var/log/vboxadd-install.logを確認 てっきりkernel-develのエラーだと思って、その周りを探していたら

端っこに

perlのコマンドがありません

と書いてあり

yum install -y perl

してから再び試したら出来ました。

perlも必要のようです。