[Bug 234205] /usr/include/sys/file.h uses the u_int typedef which causes C compilation to sometimes fail

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234205

            Bug ID: 234205
           Summary: /usr/include/sys/file.h uses the u_int typedef which
                    causes C compilation to sometimes fail
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: misc
          Assignee: bugs at FreeBSD.org
          Reporter: deepbluemistake at gmail.com

If you compile a program, and give -D_XOPEN_SOURCE=700 to the compiler, and the
program has #include <sys/file.h> the compiler gives an error like this:
/usr/include/sys/file.h:226:2: error: unknown type name 'u_int'
        u_int   xf_flag;        /* flags (see fcntl.h) */
and then bails out.
Why is the u_int typedef used instead of 'unsigned int' itself?  It's
unnecessary other than to save a couple keystrokes while typing.

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