Am I right understand the dub.json system?

[Edwin van Leeuwen via Digitalmars-d-learn]

On Monday, 29 February 2016 at 12:27:04 UTC, Suliman wrote:
> For example I have got app that depended on DDBC. In 
> configuration section DDBC related on:
>
> "libs-posix": [
> "sqlite3",
> "pq"
> ]
>
> Does it's mean that it will try to find this 2 libs in any 
> case? Even I do not use them.
>
> If I do not need them what I should to do? Fix 
> ~/.dub/packages/ddbc and remove this strings from it, or what?

Reading the dub.json from ddbc it seems you can specify which 
version you want. So if you only need mysql support you add
"versions": ["USE_MYSQL"],
in your own dub.json file.