as https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219471 say FreeBSD make is bmake,but the man page of make and /usr/share/mk/bsd.README still reference this doc: man of page: This manual page is intended as a reference document only. For a more thorough description of make and makefiles, please refer to PMake - A Tutorial. /usr/share/mk/bsd.README: See also make(1), mkdep(1), style.Makefile(5) and `PMake - A Tutorial', located in /usr/share/doc/psd/12.make.