It should prompt when there's a feed that can be satisfied by the distro, just as it does for linux. See https://github.com/gfxmonk/0readme/commit/6c52ddbe466f78ec43fd917648bd950858b72f07#commitcomment-1212161
There is no PackageKit integration for MacPorts, but it could do something like the apt-cache does:
"This program depends on '%s', which is a package that is available through your distribution. "
"Please install it manually using your distribution's tools and try again."
Then again, installing packages isn't Zero Install.
Also, MacPorts doesn't have an interface to the packages - only to the ports...
So there is no guarantee that there is a package available, or what size it has.
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