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POSIX made the getitimer/setitimer API obsolescent a decade ago, and now's a
good time for Emacs to rely on the current timer_gettime/timer_settime API
instead. I've proposed patches for this in Bug#32746. If you know a platform
that is a current porting target of Emacs and lacks timer_gettime/timer_settime
but has getitimer/setitimer, please send email to <address@hidden> about
it. (MS-Windows lacks both APIs; the proposed patches attempt to address that
special case.)