[Nix-dev] Override php xslSupport config option

[Jookia]

On Sun, Oct 30, 2016 at 09:59:20PM +0300, Игорь Пашев wrote:
> Something like this:
> 
> { php70 }: php70.merge {
>   cfg = {
>     apxs2Support = false;
>     ldapSupport = false;
>     mssqlSupport = false;
>     pdo_pgsqlSupport = false;
>     postgresqlSupport = false;
>     sqliteSupport = false;
>     xslSupport = false;
>   };
> }
> 
> Use this with nixpkgs.config.packageOverrides

It's really obscure how to use these old-timey .merge{} operations. Maybe it
should be documented somewhere or finally replaced with proper overrides?