Makefile Optimization: $(shell) and := go Together

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and $(shell) in your Makefile is to run the command:

grep -n \$\(shell Makefile | grep -v := 

It'll print out the line number and details of every line in Makefile that contains a $(shell) and doesn't contain a :=. Take a look at what it finds to see if your Makefile can be optimized.

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