Unconditional dependencies:
	libc

For Argon2 support:
	libar2simplified
	libar2
	libblake (indirect)
	pthread (indirect)

Build dependencies:
	make
	sh
	echo
	true
	false
	c99
	ar

Install dependencies:
	make
	sh
	echo
	true
	false
	mkdir
	cp
	ln

Notes:
	make(1) must support `+=` and `!=` as defined by
	The Open Group Base Specifications Issue 8 (the 2024 edition);
	strict The Open Group Base Specifications Issue 7 (the 2018 edition)
	compliance is not sufficient.