+# TODO: when deleting this Makefile, don't forget to also delete conftest.cpp
+# which is only required by this Makefile
+
ifeq ($(I_KNOW_MAKEFILE_IS_DEPRECATED),)
$(shell printf 'ERROR: Makefile build is deprecated, use CMake instead, see README.md\n\n' >&2)
$(error I_KNOW_MAKEFILE_IS_DEPRECATED is not set)