You might only allow defaults to be added to the end, or you
might allow goals to be called with labelled parameters.
-Fix: You must use 'all ()' on the command line.
-
Deleting target files if goals is interrupted, but only if the
timestamp changes (what about non-*files?). Also: atomic code. This
will delete the target if the code doesn't run to completion. (make
doesn't do this, but probably it should).
-Implement parallel builds.
+Parallel builds: On failure, wait for other jobs to finish.
Conditional sections (same as "ifeq" etc in make).