Access

Make variable

Use as a Make variable:

• Makefile

    FOO = a
    BAR = 1
  
    test:
        echo "$(FOO) $(BAR)"
  

$ make test
echo "a 1"
a 1

The quotes are not strictly needed.

Note that if you use single quotes, the variables will still be evaluated.

Shell variable

Or use it as a Shell variable. NB. The $ must be escaped as $$.

FOO = a
BAR = 1

test:
    echo "$(FOO) $(BAR)"