Follow-up Comment #10, bug #27609 (project make):
Yes, both .y.c and .l.c suffix rules are required by the POSIX standard.
However, they've been present in GNU make for over 20 years, since before
POSIX standardized make, so while POSIX requirements are one reason to keep
them, their existence cannot be blamed on POSIX.
I recommend getting into the habit of adding a ".SUFFIXES:" target to your
makefiles to disable the built-in suffix rules, so that the worst that can
happen if your rules fail to apply for some reason is that make complains it
doesn't know how to build the target.
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