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@jwildeboer The backslash is interpreted by the shell, the single "$" is interpreted (consumed) by make, as it tries to access a variable $" (dollar-sign, followed by double-quote). To echo a "$", you need to:

1. Escape using "\" for the shell
2. Escape using "$$" for make

Note how the make output of the first file is just the line:

echo "\

And the second invocation gets it as:

echo "\$"