I am not sure of the need for the 'true' or not. it seems it is not
required but should work either way?

From the manpage:

The values of variables are ignored regardless of their setting; even if they would be set to ``FALSE'' or ``NO''. Just the existence of an
    option will cause it to be honoured by make(1).

so the plain option is enough. If the machines are in environment where they might be someday administered by someone else, I'd use pure option to avoid confusing someone who hasn't read the manpage and thinks setting variables to false will void them.

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