[COMMIT] Eliminate byte compiler warnings, give nicer errors in the absence of packages

[Aidan Kehoe]

APPROVE COMMIT

NOTE: This patch has been committed.

 Ar an séiú lá de mí Lúnasa, scríobh Aidan Kehoe: 

 > [...]

-- 
On the quay of the little Black Sea port, where the rescued pair came once
more into contact with civilization, Dobrinton was bitten by a dog which was
assumed to be mad, though it may only have been indiscriminating. (Saki)