[GHC5] Creating Socket.PortNumber from Int?

[Volker Stolz]

Until 5.00 I could use mkPortNumber to get what I want, i.e.
  PortNumber (mkPortNumber port)
Now in 5.01, this function now longer exists.
(PortNumber 5) works, but (PortNumber (5::Int)) does not, so I
have to use "fromIntegral" to get it to work again:
  PortNumber (fromIntegral (5::Int))

I suppose I'm missing something essential here, as there must be a 
better way of doing it when passing a variable of type Int.
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