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When I asked "is there no way to get these types", I didn't
expect that the answer would be "sure, Python can define
them itself". By that approach, you wouldn't need any system
headers, but could include any declaration literally in
Python, with #ifdef UW7. This is clearly not the right
solution: I meant to ask "is there no way to get these types
*from the system headers*"

If the answer to that question is "no", then I'm still
curious what the answer to the question "Why *specifically*
do we need u_int in the first place?" is. By "specifically",
I mean what *specific* other declaration from the system
headers relies on it, saying that sys/socket.h needs it is
too general.

I'm willing to go with the simple patch, provided it is
changed in the following way:
1. A comment is added indicating what the specific reason
for this patch is.
2. The system check is strengthened to not include future
system releases. I.e. saying OpenUNIX/8.*|UnixWare/7.* is
too generic: include a list of minor system releases so far.