testcase/implicit_pattern_rule_prefix.mk

MAKEVER:=$(shell make --version | grep "Make [0-9]" | sed -E 's/.*Make ([0-9]).*/\1/')

test: abcd

abcd:

# GNU make 3 does not prioritize the rule with a shortest stem.
ifeq ($(MAKEVER),4)
a%:
	echo FAIL
endif
abc%:
	echo PASS
ab%:
	echo FAIL