bash - Sourcing a bashfile before running a command -

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suppose have following file demo.env:

export value="abcd"

how can make works mafile rule?

bash -c "source demo.env; echo $${value}"

apparently 1 way is:

bash -c "source demo.env; echo \${value}"

and in makefile rule:

echo:     bash -c "source demo.env; echo \$${value}"

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