if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.24.0") FetchContent_Declare( GSL URL https://github.com/microsoft/GSL/archive/refs/tags/v4.0.0.zip URL_HASH SHA1=cf368104cd22a87b4dd0c80228919bb2df3e2a14 FIND_PACKAGE_ARGS 4.0 NAMES Microsoft.GSL DOWNLOAD_EXTRACT_TIMESTAMP TRUE SOURCE_SUBDIR not_set ) else() FetchContent_Declare( GSL URL https://github.com/microsoft/GSL/archive/refs/tags/v4.0.0.zip URL_HASH SHA1=cf368104cd22a87b4dd0c80228919bb2df3e2a14 ) endif() FetchContent_MakeAvailable(GSL) set(GSL_INCLUDE_DIR ${gsl_SOURCE_DIR}/include)