.\" $FreeBSD$
Enable building in meta mode.
.Pp
The build is driven by dirdeps.mk using DIRDEPS stored in
Makefile.depend files found in each directory.
.Pp
The build can be started from anywhere, and behaves the same.
The initial instance of make recursively reads DIRDEPS from Makefile.depend
computing a graph of tree dependencies from the current origin.
See http://www.crufty.net/help/sjg/dirdeps.htm
.Pp
As each target is made
.Xr make 1
produces a meta file which is used to capture (and compare)
the command line,
as well as any command output.
If
.Xr filemon 4
is available the meta file will also capture a record of syscalls
used to produce the target.