First, install the packages needed by Shairport Sync:
```
-# apt install --no-install-recommends build-essential git xmltoman autoconf automake libtool \
+# apt install --no-install-recommends build-essential git xxd xmltoman autoconf automake libtool \
libpopt-dev libconfig-dev libasound2-dev avahi-daemon libavahi-client-dev libssl-dev libsoxr-dev \
libplist-dev libsodium-dev libavutil-dev libavcodec-dev libavformat-dev uuid-dev libgcrypt-dev
```