Cannot use pkg manager as it requires an upgrade....
pkg upgrade
Updating FreeBSD repository catalogue...
FreeBSD repository is up to date.
All repositories are up to date.
New version of pkg detected; it needs to be installed first.
Checking integrity... done (0 conflicting)
The following 1 package(s) will be affected (of 0 checked):
Installed packages to be UPGRADED:
pkg: 1.10.5_1 -> 1.10.5_5
Number of packages to be upgraded: 1
Proceed with this action? [y/N]: y
[1/1] Upgrading pkg from 1.10.5_1 to 1.10.5_5...
[1/1] Extracting pkg-1.10.5_5: 16%
pkg: Fail to create temporary file: /usr/local/lib/.libpkg.a.OUTvZRrnMLYC:Operation not permitted
[1/1] Extracting pkg-1.10.5_5: 100%
I am betting all you needed to do was sudo.
Did you try running "sudo pkg upgrade"?