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doc: note that timer_settime() comes from librt on some systems
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* @brief Native CPU periph/timer.h implementation
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*
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* Uses POSIX realtime clock and POSIX itimer to mimic hardware.
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* This is done with the timer_settime(3), timer_create(3) interfaces, which are
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* sometimes found only in the -lrt library, and not in glibc.
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*
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* This is based on native's hwtimer implementation by Ludwig Knüpfer.
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* I removed the multiplexing, as ztimer does the same. (kaspar)
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