questionable feature in FreeBSD pmake

[M. Warner Losh]

In message: <200410281023.i9SAN27L001781 at mist.nodomain>
            Dan Strick <strick at covad.net> writes:
: Does anyone know where this feature came from?  The .OBJDIR variable was
: recognized by the pmake distributed with 4.4 BSD, but the man page for
: that version of make does not mention the gratuitous magic rules for
: changing the make working directory.  The older make program found in
: 4.3 BSD does not seem to use the .OBJDIR variable at all.
: 
: This feature is not mentioned in the pmake tutorial found in
: /usr/share/doc/psd/12.make.  Is it a FreeBSD-ism?

Both FreeBSD and NetBSD have this feature.  Early in the FreeBSD life
cycle, it was imported from NetBSD shortly after the 2.0 tree was
imported from 4.4-lite.

Warner