may be too difficult to upgrade due to resource demands.
Only depend on Free Software packages which exist in the "main"
-section of Debian 7.0 and later. (We will bump version requirements
-as time passes, but this is current as of January 2016).
+section of Debian "stable" distribution. That is Debian 9.x
+("stretch") as of this writing, but "oldstable" (8.x, "jessie")
+remains supported for v1 repositories.
+
In general, we favor mature and well-tested old things rather than
the shiny new.