if(MSVC) message(FATAL_ERROR "MSVC will not be supported") endif() if(UNIX AND APPLE) message(FATAL_ERROR "Apple is not currently supported") endif() if(${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD") message(FATAL_ERROR "FreeBSD is not currently supported") endif() if(PROJECT_REQUIRE_ALPINE AND NOT PROJECT_IS_ALPINE AND PROJECT_IS_MINGW AND PROJECT_IS_MINGW_UNIX) message(FATAL_ERROR "Project requires Alpine Linux to build") endif()