Subject: Re: Installing into DESTDIR
To: None <niklas@appli.se>
From: Charles M. Hannum <mycroft@gnu.ai.mit.edu>
List: current-users
Date: 12/11/1994 07:15:09 
   2	In bsd.dep.mk AINC isn't used when depending C & C++ files so
	   /usr/include is sought instead of $DESTDIR/usr/include.

It's not supposed to.  That's why sys.mk modifies CPPFLAGS.

   3	AINC isn't set apart from the src/lib/libc environment.

Again, it's not supposed to.