Until now it was not easy to verify that a SWC has no missing reference to classes, interfaces or functions.

Here we have a small Web project:
LibProblemProjectBase
Actually no errors or warnings are shown, but this might be incorrect.

The switch Generate Problems/Tasks activates the SWC dependency verification:
LibProblemProjectBuildOrderProperties
This switch will be active by default for all new projects and all their libraries.
If you are aware about certain missing dependencies for a library you can manually deactivate the SWC dependency verification for that SWC.

The project is rebuild and two warnings have appeared:
LibProblemProjectWarnings

The FlexUnit libraries have a few unresolvable references:
LibProblemProjectWarningsOpen
The solution is to provide such classes, interface or functions. Since all these missing dependencies starts with package mx chances are high that some SWC of the SDK is missing.

The framework library contains all required classes, interfaces and functions:
LibProblemProjectWarningsResolved