The clingcon-5 project is still in development. A release has to wait until clingo-5.5.0 is ready. The project is already usable with the latest development version of clingo. The latest stable clingcon release is 3.3.0 available under the releases tab and in the clingcon-3 branch.
Building with conda
conda create -n clingcon -c potassco/label/dev -c conda-forge clingo ninja cmake gxx_linux-64 libcxx clang-tools conda activate clingcon make
The Makefile is meant for development and sets up cmake to use
is also possible to create a compile database to use with linting plugins.
conda install -n clingcon -c programfan compdb conda activate clingcon make compdb
With this, plugins like vim-ale should be able to lint the source code while editing.