POSIX 1003.1 and <sys/types.h>

[james.stuhlmacher]

From: jrstu at cbnewsd.ATT.COM (james.stuhlmacher)

I was told by someone that the POSIX standard does not allow
including <sys/type.h> in any of the other include files such as
<grp.h>.  Is this true?  I could not find this anywhere in the book. 
If it is true, why is this the case? 

Thank you for any help you can provide.

Jim Stuhlmacher
j.stuhlmacher at ATT.com
..!att!ihlpb!jims

Volume-Number: Volume 17, Number 106