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 If your system does not use PulseAudio, then it is likely that it uses the Advanced Linux Sound Architecture (ALSA), so you should build Shairport Sync with the ALSA backend. By the way, many systems with PulseAudio also have ALSA (in fact, PulseAudio is effectively a client of ALSA); in those cases you should choose the PulseAudio backend.
 
+If PulseAudio is not installed, there is no necessity to install it for Shairport Sync. In fact, Shairport Sync works better without it.
+
+**Building** 
+
 To build Shairport Sync from sources on Debian, Ubuntu, Raspbian, etc. follow these instructions.
 
 The following libraries are required: