[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 - Stanislas Bach (sbach)

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Yes, the error will occur only if we are calling the Makefile from outside the sources directory.

More precisely, it will happen if the $(pwd) is different from the sources directory.
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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#comment648