typedefs, etc.

[obrien%rand-unix at sri-unix.UUCP]

	Unfortunately there's a problem with the 4.1BSD VAX compiler in that
"enum"s don't do the right thing.  They're really treated as a separate
data type and give type clashes.  This may have been fixed in other
compilers.  In fact in our compiler they can't even be ordinally compared;
you can only test for equality.  We're thinking of fixing this.