benalexau [1] filed a deletion request for libnx [2]:

This package is now quite out of date and later versions are only available from upstream through user-specific FTP accounts. As such this package is no longer generally useful to the community.

[1] https://aur.archlinux.org/account/benalexau/ [2] https://aur.archlinux.org/pkgbase/libnx/