Иначе пользователи alsa ничего не слышат.
libao-1:1.2.2-alt5 -> sisyphus: Mon Nov 23 2020 Vladimir D. Seleznev <vseleznv@altlinux> 1:1.2.2-alt5 - NMU: fallback to alsa driver if pulse fails (closes: #39337) - backported from e2k (thx mike@): + piggyback our CFLAGS as these don't get respected by libao (thx ldv@ yet again)