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Ardour
8.12
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24 # define timersub(a, b, result) \
26 (result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \
27 (result)->tv_usec = (a)->tv_usec - (b)->tv_usec; \
28 if ((result)->tv_usec < 0) { \
30 (result)->tv_usec += 1000000; \