[FS#196] SOURCE_DATE_EPOCH unset while calling the Makefile from the outside

[LEDE Bugs]

The following task has a new comment added:

FS#196 - SOURCE_DATE_EPOCH unset while calling the Makefile from the outside
User who did this - Mathias Kresin (mkresin)

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I've problems to understand what your report is about. Do you get this error only if you are calling the Makefile from the outside or do you get the error during a "normal" LEDE build?
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=196#comment603