Due to an influx of spam, we have had to temporarily disable account registrations. Please write an email to accountsupport@archlinux.org, with your desired username, if you want to get access. Sorry for the inconvenience.
see https://github.com/zxing-cpp/zxing-cpp/releases/tag/v2.2.0 and https://github.com/zxing-cpp/zxing-cpp/commit/d3a8d5f793ed0c32e53283ccf079f390780491a0