How to escape 2 dollar signs inside a Makefile? [duplicate]

$$ in a make file is replaced by $, try following:

curl -u 'username:pa$$$$word' https://example.com

and see Macros section in make specification.

curl makefile escaping

Inside double-quotes,the shell needs backslashes to avoid dollar expansion.

Makefiles require doubling of dollars to cause a dollar.

So, to use dollars inside double-quotes in a Makefile, you have to do both:

rule:        shell-command ... "pa\$$\$$word" ...

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