Re: [gentoo-user] Is Gentoo wiping out Gtk 2 support from packages that support it?

[Stroller <stroller@stellar.eclipse.co.uk>]

I'm not expert enough on this subject to be *advocating* this approach, but this is how I would have expected it to behave:

On 8 July 2011, at 14:14, Albert Hopkins wrote:
> 
> On Friday, July 8 at 13:11 (+0100), Stroller said:
> 
>> Taking a look at this bug today, is there any reason why the ebuild
>> shouldn't simply RDEPEND="x11-libs/gtk+" (i.e. remove the explicit dep
>> on gtk3), detect what version you have installed on your system and
>> then either run --enable-gtk3 or --enable-gtk2 during src_configure(),
>> depending upon which you're using?
> 
> ebuilds generally don't do this, because it is bad.  What you have and
> what you want aren't necessarily the same thing.  Consider:
> 
>      * You don't yet have any gtk installed

Highest version of gtk in tree is pulled in as a dep (subject to masking, ARCH, ~ARCH, &c)

>      * You have gtk2 but actually *want* the gtk3 version, so you want
>        the ebuild to pull in gtk3 (or vice versa)

emerge -u1 x11-libs/gtk+  (assuming gtk3 is now stable)
or
emerge -1 =x11-libs/gtk+-3.0.10

(but gtk3 will probably be pulled in by Gnome3 (??) automatically when the user upgrades to that)

>      * You have both gtk2 and gtk3 installed.

Compile against the higher one

>      * You have gtk installed, but don't want gtk support for a
>        particular package (if gtk support is optional for that
>        package).

This is when you should be using USE="-gtk", surely? Whether v2 &/or v3 of gtk is supported is irrelevant. 

Stroller.