Include files that depend on include files

[Dirk GOUDERS]

 > > Can you point me to a real-life example where such a mechanism is
 > > used?  I'd like to have a closer look at it.
 > 
 > /usr/include/sys/types.h :-)

Thank you :-)  Now, I found the comment in
/usr/include/machine/ansi.h that also describes this mechanism.

Thanks for all other answers, as well.

Dirk