message(FATAL_ERROR "File ${catch2_dir}/CMakeLists.txt does not exist! The submodules were not downloaded! GIT_SUBMODULE was turned off or failed. Please update submodules and try again.")
# Download automatically, you can also just copy the conan.cmake file
if(NOT EXISTS "${CMAKE_BINARY_DIR}/conan.cmake")
message(STATUS "Downloading conan.cmake from https://github.com/conan-io/cmake-conan")