Upgrading of port [graphics/mesa-dri] from v18.1.8 to v18.1.8_1 fails on deinstallation task.
Following error could be detected:
---> Deinstalling 'mesa-dri-18.1.8'
---> Preserving /usr/local/lib/libXvMCr600.so.1 as /usr/local/lib/compat/pkg/libXvMCr600.so.1
cp: symlink: libXvMCr600.so.1.0.0: File exists
Are you using portmaster or something similar?
Error occurs on using portupgrade.
Probably a bug in portupgrade --preserve. I don't see anything wrong with symlinks created by mesa-dri.
Please open again if it is still happening for you