> Any comments about this problem?  Should any header file which uses
> e.g. `u_long' include <sys/types.h>?

In my opinion, yes.  I've discussed this on various NetBSD lists at
least three times, and my opinion appears to be in enough of a minority
that every time I bring up such header-file bugs (for that's what I
consider them), I'm told they're not bugs and will not be fixed.

I would love to see this change. :-)

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