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After upgrading lib32-glibc to lib32-glibc-2.26-2-x86_64.pkg.tar.xz stopped iR2520 network printer working.
Downgrading to lib32-glibc-2.25-7-x86_64.pkg.tar.xz make the printer working again.
Hints are here: https://aur.archlinux.org/packages/cndrvcups-lb/
Thanks.
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