a821 [1] filed a deletion request for csl [2]: Abandoned package from 2015. Last version released from upstream in 2008. The PKGBUILD's been broken since at least 2015 (noted in 2018) since there is no package() function. No votes nor reverse depends. Safe to delete.
[1] https://aur.archlinux.org/account/a821/ [2] https://aur.archlinux.org/pkgbase/csl/
