Some gems like matrix or rexml were added at some point to ruby becoming so-called default gems. But they may be removed from being default in newer ruby versions, resulting in broken builds like for us with prawn.
In most such cases it is the best to update the used gem (for us prawn) to a newer version, which defines the missing gem as required for this specific ruby version.
Read the full article here at qameta.com: Fixing require LoadError as an example for the matrix gem
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