[avr-gcc-list] Using PORTB with variables, PORTB = var

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Hiyas,

  How can I use the PORTB constant with variables? eg:

while (1) {
  var <<= 1;
  PORTB = var
}

That is what I'm trying to acheive.  I'd like to be able to do it with variables
like I do above, but it doesn't seem to work.  Once I replace "var" with an
actual number, it works as expected.

Can someone help me out here?  URL? reference?

Thanks,

Chris-