cc/Makefile.inc use (abuse?) LDDESTDIR for their internal libraries
so "?=" hides non-default external libraries. Adding multiple paths
to LDDESTDIR works except it makes it even harder than usual to
decide which libraries will actually be linked against.
Build an intermediate object file even when there is only one source
file. This costs a little space but saves time if the target is rebuilt
a lot, and it stops the target varying with the name of temporary
intermediates.
Use ${ECHO} instead of `echo' so that `make -s' is fairly quiet.
Use ${ECHODIR} instead of echo for printing directory names so that
`make -ss' is very quiet.
Makefiles.
DANGER WILL ROBINSON!
This will cause repeat installs of certain programs, such as `init' and
`rcp', to fail unless one of the two conditions is met:
1) You are in single-user mode.
2) Your security level is set to 0 or -1.
If you have compiled a kernel from the latest sources, your kernel
security level is set to -1 by default, which will keep `init' from
fiddling with it. You can increase it, but not decrease it, from the
command line with the command `sysctl -w kern.securelevel=<new value>'.
I believe that -1 is the most appropriate value to use while we are still
developing the code, although when we ship it should be changed back to 0.
See init(8) for more information.
