Re: [gentoo-user] What's the best way to force a particular version of a dependency

[Rich Freeman]

On Sun, Jun 7, 2020 at 2:56 PM n952162 <n952162@×××.de> wrote:
>
>
>      $ equery list \* | grep readline
>      sys-libs/readline-7.0_p5-r1
>
> But, given your answer about exclusivity/inclusivity in the other thread, I guess this result is questionable...

This is just showing what version you have installed, not what
versions are available.

>
> The ebuild for bash-5.0_p17 has:
>
>   READLINE_VER="8.0"
>
> The ebuilds for other the other users don't, I believe.

So, first, this is just a random local variable and has no meaning in
and of itself.  It is used in the dependency string which makes that
version of bash dependent on readline v8 specifically.  Other packages
that don't list a version of readline will accept any version that
isn't masked/etc.  So they're fine with v8.

>
> The emerge that I used was this:
>
> emerge -auDv --verbose-conflicts --changed-use --keep-going --with-bdeps=y --changed-deps --backtrack=100 @system

Yeah, you might have to include the other packages that need readline
if portage complains.

>
> However, I was just able to get it to build with this script:
>
> $ cat update-readline
> #!/usr/bin/env bash
> emerge -uUv $(cat <<-eof
> sys-libs/readline
> dev-db/postgresql
> sys-apps/gawk
> net-wireless/wpa_supplicant
> sys-fs/lvm2
> dev-lang/python
> dev-lang/lua
> sci-visualization/gnuplot
> dev-db/postgresql
> app-text/hunspell
> sys-fs/udftools
> sys-block/parted
> x11-wm/fvwm
> net-misc/ntp
> sys-devel/gdb
> dev-db/postgresql
> sys-libs/gdbm
> net-mail/mailutils
> app-misc/rlwrap
> sys-devel/bc
> dev-libs/libxml2
> net-dns/bind-tools
> eof
> )
>

That will probably work.  Offhand I'm not sure if you need to add -1 /
--oneshot to that to prevent all that cruft from being added to your
world file.

-- 
Rich