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Why include header file <sys/_types.h> in <stddef.h> for FreeBSD >= 5 ?


Hello,

I'm figuring out the code in

/usr/lib/gcc/x86_64-redhat-linux/4.1.1/include/stddef.h,

and I saw the macro switch below:

#if defined (__FreeBSD__) && (__FreeBSD__ >= 5)
#include <sys/_types.h>
#endif

I have gone through all the <sys/_types>、<sys/cdefs.h> and
<i386/include/_types.h> source files for the whole 5.X.X version of
FreeBSD, and still can't find anything may affect the behavior of code
below that macro switch in <stddef.h>.

Can someone please help in figuring out this ?

Thanks in advance.

--
Zachary


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