If you’ve exported the environment variable:
export demoPath=/usr/local/demo
you can simply refer to it by name in the makefile (make imports all the environment variables you have set):
DEMOPATH = ${demoPath} # Or $(demoPath) if you prefer.
If you’ve not exported the environment variable, it is not accessible until you do export it, or unless you pass it explicitly on the command line:
make DEMOPATH="${demoPath}" …
If you are using a C shell derivative, substitute setenv demoPath /usr/local/demo for the export command.
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