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    After running above steps, had to restart guest system before reinstalling vbox guest additions again.
    – Reddy
    Commented Jun 2, 2015 at 11:14
  • This was the right package to install, however recompiling the kernel modules required root privileges, and running something in root will lose your environment variables (including KERN_DIR). I instead did sudo -s followed by export KERN_DIR=/usr/src/kernels/XXX but I'm sure there's a better way to persist variables into sudo mode
    – Migwell
    Commented Jan 8, 2016 at 0:14
  • In my case (CentOS 6.7) [uname -r] is [2.6.32-573.el6.x86_64], but [ls /usr/src/kernels/] prints [2.6.32-573.22.1.el6.x86_64] So be careful and use actual existing dir name
    – jnr
    Commented Apr 8, 2016 at 13:09
  • 1
    source ~/.bashrc to set KERN_DIR in the current environment without having to restart.
    – Justin
    Commented Aug 16, 2016 at 14:16
  • I got errors that its not a directory. Note that it needs a slash at the end.. echo export KERN_DIR=/usr/src/kernels/uname -r/ >> ~/.bashrc
    – Artjom Kurapov
    Commented Sep 30, 2016 at 5:41