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Say your dependencies specified in your Makefile (or dates on your source files) is causing 'make' to
skip some source-files (that it should not) or on the other other end, if it is causing make to always build some source-files regardless of dates of target, then above command is handy to find out what 'make' thinks of your date v/s target date-wise or what dependencies are in make's view-point.
The egrep part removes the extra noise, that you might want to avoid.
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