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!message
--------
The !message directive lets you send messages to the screen from a
makefile. You can use these messages to help debug a makefile that
isn't working the way you'd like it to. For example, if you're having
trouble with a macro definition, you could put this line in your
makefile:

  !message The macro is defined here as: $(<MacroName>)

When MAKE interprets this line, it will print onscreen "The macro is
defined here as: .CPP", if the macro expands to .CPP at that line.
Using a series of !message directives, you can debug your makefiles.