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I'm trying to install the Tunnelblick open source VPN client on my Mac running OS X 10.10.5.

When I try to install the dmg I get the following error (see attached screenshot).

enter image description here

How would I make my /usr folder secure? The account I use by default is my main user account, but also the admin account for the computer. Would it be a question of making a my main user account a standard user and setting up a separate admin account?

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It seems the permissions on /usr are incorrect, which in the past has been attributed to installing MacPorts. You can repair the permissions on /usr by running:

sudo chown root:wheel /usr
sudo chmod 0755 /usr

Since MacPorts installs to /opt/local, this shouldn't affect MacPorts, but as I don't use MacPorts I can't say for certain.

  • The standard installation dir of MacPorts is /opt/local/ or do I miss a comment deleted in the meantime!? – klanomath Jan 16 '18 at 14:09
  • @klanomath I remember something about MacPorts and /usr in the past and it turns out Tunnelblick themselves also mentions MacPorts as a potential cause; I've added a link. – grg Jan 16 '18 at 18:16

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