Running them twice usually destroyed the target binary. E.g., the
second `make objlink' in `make objlink; make; make objlink' replaced
the `cat' binary by a symlink cat@ -> /usr/obj/usr/src/bin/cat.
`ln -fs' is unusable when the target might be a symlink that resolves
to a directory. Then -f applies to a file in the directory and not
to the symlink. This seems to be the standard (and sometimes useful)
behaviour.
Create 'obj' directory in current directory instead
a symbolic link to the 'obj' tree if defined. [not set]
Print a warning if 'obj' tree (/usr/obj) does not exist.
Change default 'obj' directory from ``obj.${MACHINE}'' back to
``obj'', unfortunately many Makefiles are wired with the name ``obj''.
Add some comments for variables and targets.
