Added note on missing dependency.

Dockerfile

@@ -5,7 +5,6 @@ FROM python:3.7.7-buster
 
 LABEL maintainer="David Trattnig <david.trattnig@subsquare.at>"
 
-RUN sed -i "s#deb http://http.us.debian.org/debian buster main contrib non-free#deb http://http.us.debian.org/debian buster main contrib non-free#g" /etc/apt/sources.list
 
 RUN set -ex \
   && rm -f /usr/bin/python && ln -s /usr/local/bin/python /usr/bin/python \
@@ -45,6 +44,7 @@ RUN opam init --disable-sandboxing -y
 RUN opam switch create 4.08.0
 RUN opam update -y
 RUN opam install depext -y
-RUN opam depext taglib mad lame vorbis flac opus cry samplerate pulseaudio bjack alsa liquidsoap -y
+# FIXME Missing "fdkaac" in dependencies below, which requires system package "libfaac-dev"
+RUN opam depext taglib mad lame vorbis flac opus cry samplerate pulseaudio bjack alsa liquidsoap -y 
 RUN opam install taglib mad lame vorbis flac opus cry samplerate pulseaudio bjack alsa liquidsoap -y
 RUN eval $(opam env)
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