MarsSeed [1] filed a deletion request for chicken-numbers [2]: This unmaintained chicken4 library last released in 2015 is broken: not compatible with repo's current chicken v5, and there is no 'numbers' module available for the latter chicken version. Also the PKGBUILD is not correct: it does not declare a source array, but instead, it executes chicken's online package manager tool to install the declared version of the module - similar to as if 'pip install modulename' was used in a Python package. But it seems not needed: the only user comment is from 2010, and no other package depends on it. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/chicken-numbers/