Define the common config variables in the Makefiles. #9002
Merged
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Define the common configuration variables globally on the Makefile.
This way anything invoked downwards from this Makefile can pick up
these variables without us having to set them for every sub invocation manually.
If we do not do this, the sub-invocations will pick up these values
from the environment and this leads to some inconsistencies that
will be difficult to track down.