I installed kernel 4.4 from ELRepo, along with kernel-lt-tools, kernel-lt-devel & kernel-lt-headers. I also installed dkms.

vboxadd-install.log contains this:

grep: Unmatched ) or \)

The vboxadd-setup.log file contains this:

Error building the module:
modprobe vboxguest failed

Is there anything I'm missing?

  • Looks like you are missing a (. Joking aside, is there a line number associated with that grep error? It seems grep wants to interpret some kind of regular expression, but trips up on the way.
    – Minix
    Jan 9, 2019 at 0:55

1 Answer 1


At least gcc and make are required, and if missing give errors building virtualbox guest additions

sudo yum install perl gcc dkms kernel-devel kernel-headers make bzip2

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