Welcome to Manjaro!
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You donât need to add repositories from Arch to Manjaro like PPAs on Ubuntu, you just need to activate the AUR (Arch User Repository) and thatâs it: all AUR packages become available to you.
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Whether or not you have to build or install is up to the package maintainer, and for you the only difference is that packages that are âbuiltâ just take a little while (up to quite a while) longer to install.
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Please read this: