Because "-include" is a non-standard[1,2] extension. "include" is standard POSIX behavior[1] but (1) does not seem to support wildcards and (2) errors if the fi

Because "-include" is a non-standard[1,2] extension. "include" is standard POSIX behavior[1] but (1) does not seem to support wildcards and (2) errors if the file does not exist, which it never will on initial build. From a glance at the man pages, OpenBSD make does support -include[2], but FreeBSD make does not[3]. [1] cf. http://pubs.opengroup.org/onlinepubs/9699919799/utilities/make.html http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ma... [2] https://man.openbsd.org/make https://man.openbsd.org/make [3] https://www.freebsd.org/cgi/man.cgi?make https://www.freebsd.org/cgi/man.cgi?make