On 10/04/19 14:33, Kurt Van Dijck wrote: > On vr, 04 okt 2019 13:52:11 -0400, James Carlson wrote: > headers under sys/ are, AFAIK, not delivered by the kernel, but by the > toolchain. sys/time.h may have less issues than time.h, it has the same > disease. I've never heard of this problem. I'm afraid I don't know what you're referring to. I've never heard of a compiler (or other tool chain component) that delivers files to /usr/include/sys. That'd be somewhat surprising to me, but I guess it's a wide world out there. As the name says, the stuff under sys/ is part of the _system_. On UNIX, the standard parts of it are described in the Single UNIX Standard, maintained by The Open Group. That's the documentation pointer I provided previously. Are there systems where system header files aren't installed by default? Sure. That's somewhat commonplace. But on such a machine you can't compile things (including pppd) until you install the (presumably optional) header files. If you look closely, you'll see that pppd/main.c already includes <sys/time.h> and it's not guarded by any conditional compilation because it's a *STANDARD HEADER FILE*. If there were problems of some sort with this include file, I'd expect they'd have surfaced by now. -- James Carlson 42.703N 71.076W <carlsonj@xxxxxxxxxxxxxxx>
