taskwarrior-3.4.2.tar.gz extracted.
read CONTRIBUTING.md
cmake -S . -B build -DCMAKE_BUILD_TYPE=RelWithDebInfo
but that command fails with:
-- Using Corrosion as a subdirectory
CMake Error at src/taskchampion-cpp/CMakeLists.txt:49 (add_subdirectory):
The source directory
src/taskchampion-cpp/corrosion
does not contain a CMakeLists.txt file.