On Arch Linux, when trying to use the phpMyAdmin 5.3 pre-release, I encountered an error: Error: Undefined constant "SODIUM_CRYPTO_SECRETBOX_KEYBYTES" Checking in Debian showed that there is no such problem with phpMyAdmin 5.3. The reason for the error is that sodium support is not enabled. How to enable sodium on Arch Linux (Manjaro, BlackArch) To enable sodium support in Arch Linux...