Why does Virtualbox need Universal binaries?

[John Ruschmeyer]

I decided to install Virtualbox via MacPorts as opposed to installing the
binary from Oracle. What has happended, though, is that MacPorts has
started recompiling dependencies with "+Universal" (currently on glib2).

What I don't understand is why this is necessary, particularly since
Virtualbox will never run on anything other than an Intel-based system?

Thanks...
JR
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