In addition to generic error messages, jam may emit one of the following:
warning: unknown rule X -
A rule was invoked that has not been defined with an "actions" or "rule" statement.
using N temp target(s) -
Targets marked as being temporary (but nonetheless present) have been found.
updating N target(s) -
Targets are out-of-date and will be updated.
can't find N target(s) -
Source files can't be found and there are no actions to create them.
can't make N target(s) -
Due to sources not being found, other targets cannot be made.
warning: X depends on itself -
A target depends on itself either directly or through its sources.
don't know how to make X -
A target is not present and no actions have been defined to create it.
X skipped for lack of Y -
A source failed to build, and thus a target cannot be built.
warning: using independent target X -
A target that is not a dependency of any other target is being referenced with $(<) or $(>).
X removed -
Jam removed a partially built target after being interrupted.
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