Debugging includes Grep all includes: g++ -E src/rl/zoo/zoo.cpp -Iinclude -Iexternal/cli11/include -o - Debuggin Build Time cmake .. -DRL_TOOLS_ENABLE_TARGETS=ON -DCMAKE_BUILD_TYPE=Release && cmake --build . --target clean && time cmake --build . --target rl_zoo Takes about 3.5s on an i9-10885H