Re: [gentoo-user] Installing 2 version-different libs in the same time

[Mike Gilbert <floppym@gentoo.org>]

On Sat, Feb 16, 2013 at 10:09 AM, Frank Schwidom <schwidom@gmx.net> wrote:
> On Sat, Feb 16, 2013 at 12:12:30PM +0000, Kerin Millar wrote:
>> On 16/02/2013 11:47, Frank Schwidom wrote:
>> > On Sat, Feb 16, 2013 at 09:13:13AM +0000, Kerin Millar wrote:
>> >> On 16/02/2013 08:36, Frank Schwidom wrote:
>> >>> Hi,
>> >>>
>> >>> I have an conflict wth 2 Versions of Readline:
>> >>>
>> >>>     (sys-libs/readline-5.2_p12-r1::gentoo, installed) pulled in by
>> >>>       =sys-libs/readline-5* required by (dev-lang/ghc-6.8.2::gentoo, installed)
>> >>>
>> >>>     (sys-libs/readline-6.2_p1::gentoo, ebuild scheduled for merge) pulled
>> >>>       in by =sys-libs/readline-6.2_p1
>> >>>
>> >>> Is ts possible to install both libraries in the same time?
>> >>
>> >> Yes. Portage can support different versions side-by-side if the ebuild
>> >> makes use of the SLOT variable. For instance, I have
>> >> sys-libs/readline-6.2_p1 installed and attempting to install readline-5*
>> >> yields:
>> >>
>> >> Calculating dependencies... done!
>> >> [ebuild  NS    ] sys-libs/readline-5.2_p14:5 [6.2_p1:0] 2,024 kB
>> >>
>> >> Note that this isn't a downgrade in so far as 6.2_p1 won't be removed.
>> >> It's a new, slotted instance of the package. No problem there.
>> >
>> > hangeLog:  Stabilize old ABI SLOT version.
>> > readline-4.3_p5.ebuild:SLOT="${PV:0:1}"
>> > readline-5.2_p14.ebuild:SLOT="${PV:0:1}"
>> > readline-6.1.ebuild:SLOT="0"
>> > readline-6.1_p2.ebuild:SLOT="0"
>> > readline-6.2.ebuild:SLOT="0"
>> > readline-6.2_p1.ebuild:SLOT="0"
>> > readline-6.2_p1-r1.ebuild:SLOT="0"
>> > readline-6.2_p4.ebuild:SLOT="0"
>> >
>> > it seems to be that in my case readline-5.2_p12-r1 ist installed under SLOT 0.
>> > can i override the slot-variable ?
>>
>> I gather that you've synced so if you run emerge -a1 '=readline-5*',
>> that should install the latest 5.2_p14 ebuild which is appropriately
>> slotted.
>>
>> Note that the latest stable version of ghc (6.12.3-r2) doesn't depend on
>> the old version of readline anyway. The main issue was that your portage
>> tree was out of date. Now that has been dealt with, I think you just
>> need to upgrade as normal. You can uninstall the old instance of ghc
>> before allowing it to re-install, in case it still blocks.
>
> The current Version is '=readline-5*'. the only thing, i want to do
> next, is to update portage, but portage wants to get a new python and
> python a new readline(-6). My Problem is, to install a new readline (-6)
> parallel to the old (-5).
>
> Would it help, to change the SLOT Variable in the ebuild files, or
>  is there any option or Variable to override the slot settings?
>

Try running this by itself:

emerge -1 sys-libs/readline:0 sys-libs/readline:5

That should upgrade readline-5.2_p12 to readline-6.2_p1 with SLOT=0,
and then install readline-5.4_p14 with SLOT=5.

You can then run your larger update, which should no longer produce
slot conflicts.