handling for the tools binaries. E.g., after libc.a is changed, it
previously took two `make' passes and one `make depend' pass following
one of the `make' passes to bring everything up to date. Now one `make'
pass followed by one `make depend' pass is sufficient.
Dependency handling seems to be difficult to handle cleanly when
interdependent things are built in different directories.
Bruce Evans
Poul-Henning Kamp
Rodney W. Grimes