Follow-up Comment #9, bug #33129 (project make):
The one in bug #30723 is correct and has been applied to the codebase (and to
various distro versions of make) for quite a while. That fix reflects the way
make worked in 3.81.
Exporting this variable is less correct because that special variable name is
written specifically to be internal to make. It's not a valid shell variable
name, for example, so it can't be used in the shell.
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