1ifeq ($(shell sha512sum --version >/dev/null 2>&1 || echo FAIL),) 2SHA512SUM = sha512sum 3else ifeq ($(shell shasum --version >/dev/null 2>&1 || echo FAIL),) 4SHA512SUM = shasum -a 512 5else ifeq ($(shell openssl version >/dev/null 2>&1 || echo FAIL),) 6SHA512SUM = openssl sha512 7else 8SHA512SUM = $(error no SHA-512 tool found!) 9endif 10