On Sun, Feb 28, 2021 at 5:44 PM Thien-Thi Nguyen <ttn@xxxxxxxxxxx> wrote: > My question is: To upgrade, which is preferred, (a) or (b)? > > (a) > #if HAVE_SYS_TIME_H > # include <sys/time.h> > #else > # include <time.h> > #endif > > (b) > #if HAVE_SYS_TIME_H > # include <sys/time.h> > #endif > #include <time.h> > > The difference is #include <time.h> is unconditional in (b), > which is OK according to my reading of the warning message > above. (Thus, my guess is (b).) Yes, (b) is what you should have, and a regular AC_CHECK_HEADERS for sys/time.h. I'll happily take a patch to make this clearer in the notes left by autoupdate and/or the manual. zw
