I successfully installed installed Shairport Sync 4.1.1 to use Airplay 2 on Volumio 3 using following steps:
sudo apt update
sudo apt install --no-install-recommends build-essential git 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 xxd
git clone https://github.com/mikebrady/nqptp.git
cd nqptp
autoreconf -fi
./configure --with-systemd-startup
make
sudo make install
sudo systemctl enable nqptp
sudo systemctl start nqptp
cd ..
git clone https://github.com/mikebrady/shairport-sync.git
cd shairport-sync/
git checkout 4.1.1
autoreconf -i -f
./configure --sysconfdir=/etc --with-alsa --with-pa --with-pipe --with-avahi --with-ssl=openssl --with-metadata --with-soxr --with-systemd --with-airplay-2
make
sudo make install
sudo systemctl stop shairport-sync
cd ..
mv /usr/bin/shairport-sync /usr/bin/shairport-sync-orig
sudo mv /usr/local/bin/shairport-sync /usr/bin/shairport-sync
sudo systemctl restart shairport-sync
systemctl status shairport-sync
Album art on the external volumio display works just fine.