This is a Kodi FLAC audio encoder add-on.
When building the addon you have to use the correct branch depending on which version of Kodi you're building against.
If you want to build the addon to be compatible with the latest kodi master
commit, you need to checkout the branch with the current kodi codename.
Also make sure you follow this README from the branch in question.
git clone --branch master https://github.com/xbmc/xbmc.git
git clone --branch Nexus https://github.com/audioencoder.flac/audioencoder.flac.git
cd audioencoder.flac && mkdir build && cd build
cmake -DADDONS_TO_BUILD=audioencoder.flac -DADDON_SRC_PREFIX=../.. -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX=../../xbmc/addons -DPACKAGE_ZIP=1 ../../xbmc/project/cmake/addons
make
The add-on files will be placed in ../../xbmc/addons
so if you build Kodi from source and run it directly
the add-on will be available as a system add-on.