- According to the "Hitchhiker's Guide To GEOS" GetSerialNumber returns a string on Apple GEOS (in contrast to a number on CBM GEOS).
Given both facts and that the API is presumably not important at all it seems reasonable to just go without it on Apple GEOS.
git-svn-id: svn://svn.cc65.org/cc65/trunk@5503 b7a2c559-68d2-44c3-8de9-860c34a00d81