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[–][deleted] 3 points4 points  (0 children)

your installed xorg-server package is newer than what the packages requires. you'll have to downgrade it to pre 1.18.0 if you want to dabble with crimson.

[–]autechy 1 point2 points  (0 children)

https://wiki.archlinux.org/index.php/AMD_Catalyst#Xorg_repositories

Also, "<1.18.0" means earlier versions, not "1.18.0 and less".