[Interest] compiling missing sql driver plugins

[Hamish Moffatt]

The Qt sources include an SQL driver plugin for Interbase/Firebird which 
is not included in the binary distributions. Is there a way to compile 
it without recompiling all of Qt?


We've been doing it for a while by going to the source plugin directory 
and running qmake then compiling, but this has broken on 5.8 due to the 
new QMAKE_USE referring to library definitions sourced from elsewhere. 
So I wonder if there is an official way instead.



Thanks

Hamish