It's a pity that this useful utility seems not to be installed by
default on Ubuntu systems.
cd osl && make && sudo make install && sudo ldconfig
sudo apt-get install autoconf libssl-dev help2man gengetopt \
libmad0-dev libid3tag0-dev libasound2-dev libvorbis-dev \
- libfaad-dev libspeex-dev libFLAC-dev libsamplerate-dev \
+ libfaad-dev libspeex-dev libFLAC-dev libsamplerate-dev realpath \
libasound2-dev libao-dev libreadline-dev libncurses-dev \
libopus-dev