Yet shared folder

[oscaroxy1]

guest: Mac sierra
host: centos 7

I installed the last release of centos 7, I create a shared folder, I insert Guest Addition CD Image ... after I mount /dev/sr0 /media/cdrom, go to /media/cdrom and
sh VBoxLinuxAdditions.run

I obtain:

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Verifying archive integrity... All good.
Uncompressing VirtualBox 5.1.14 Guest Additions for Linux...........
VirtualBox Guest Additions installer
Removing installed version 5.1.14 of VirtualBox Guest Additions...
Copying additional installer modules ...
Installing additional modules ...
vboxadd.sh: Building Guest Additions kernel modules.
Failed to set up service vboxadd, please check the log file
/var/log/VBoxGuestAdditions.log for details.

/var/log/VBoxGuestAdditions.log

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vboxadd.sh: failed: Look at /var/log/vboxadd-install.log to find out what went wrong.
vboxadd.sh: failed: Please check that you have gcc, make, the header files for your Linux kernel and possibly perl installed..
chcon: non è possibile applicare un contesto parziale al file non etichettato "/usr/lib64/VBoxGuestAdditions/mount.vboxsf"

/var/log/vboxadd-install.log

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/tmp/vbox.0/Makefile.include.header:97: *** Error: unable to find the sources of your current Linux kernel. Specify KERN_DIR=<directory> and run Make again.  Stop.
Creating user for the Guest Additions.
Creating udev rule for the Guest Additions kernel module.

I done:

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yum install dkms binutils gcc make patch libgomp glibc-headers glibc-devel kernel-headers kernel-devel
echo export KERN_DIR=/usr/src/kernels/`uname -r` >> ~/.bashrc

but nothing, I reboot, always self error.

thanks

[oscaroxy1]

update .... after 1000 evidence I otain this error:

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/tmp/vbox.0/Makefile.include.header:106: *** Error: KERN_DIR does not point to a directory.  Stop.
Creating user for the Guest Additions.
Creating udev rule for the Guest Additions kernel module.

rpm -qa kernel\* | sort

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kernel-3.10.0-514.6.1.el7.x86_64
kernel-3.10.0-514.el7.x86_64
kernel-devel-3.10.0-514.2.2.el7.x86_64
kernel-devel-3.10.0-514.6.1.el7.x86_64
kernel-headers-3.10.0-514.6.1.el7.x86_64
kernel-tools-3.10.0-514.6.1.el7.x86_64
kernel-tools-libs-3.10.0-514.6.1.el7.x86_64

yum install kernel-devel

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already installed and latest version

[socratis]

Moving to "Linux Guests" from "OSX Guests".

[oscaroxy1]

How I move it?
have I to rewrite the post?

[mpack]

Socratis already moved it. His post was a notification, not an instruction.