MarsSeed [1] filed a deletion request for blueshift [2]: Discontinued since 2017, repo archived. [a] It was an xflux/redshift alternative. As per readme, it became defunct on then-newer versions of X server. [b] Not needed, as there are working alternatives on popular graphical desktop environments. [a]: https://github.com/maandree/blueshift [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/blueshift/