Platform in updates.xml

[BoomerET]

Just recently I added platform="win" to my updates.xml file.

I did this since I don't have access to a Mac machine.

In order for my .hl files to work on a mac, do they need to be compiled on a Mac, and therefore two listings in my xml file?

I see this is how the Community Bestiary is done.

Or can I just leave off the platform line and it will work in both environments?