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time.h has existed since C89 so is a standard header expected to always be available. sys/time.h was an optional header that historically only some platforms provided. If there is a conflict on specific platforms it is better to '#if !defined()' that specific niche platform with the problem if both headers are included in the same compile unit. But I don't think this is a problem in modern times. So this results in a resolution that removes #ifdef around time.h and the detection by configure for the availabiltiy of sys/time.h. K&R obsolete syntax removal for C23 compatibility series