Follow-up Comment #1, bug#65359 (group make): Because then Make runs the command with a shell and, perhaps particularly after Shellshock, shells are increasingly diligent about cleaning the environment (eg https://stackoverflow.com/questions/36989263/why-cant-environment-variables-with-dashes-be-accessed-in-bash-4-1-2), so what could Make do? I guess it could warn that your export is unlikely to work reliably.
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