[arch-general] pacman's "Depends On"

[Ralf Mardorf]

On Thu, 23 Apr 2015 17:06:39 +0200, Simon Hanna wrote:
>are you sure everything is updated and you aren't using testing?!

Hi,

I'm aware that libvpx isn't up to date on my machine. I need to keep an
outdated version of Virtualmachine and to run it, I need the outdated
version of libvpx.

$ pacman -Q libvpx ; pacman -Si libvpx | grep Ver
libvpx 1.3.0-1
Version        : 1.4.0-2

Some packages mention that they need a dedicated version of libvpx.

$ pacman -Si ffmpeg ffmpeg-compat | grep On
Depends On     : [snip] libvpx.so=2-64 [snip]
Depends On     : [snip] libvpx.so=2-64 [snip]
                                 ^^^^^
                                 Pointer to the needed version

So I'm aware about it and forced to downgrade those ffmpeg packages
too, that's what I did. Alternatively I also could use ABS and try to
build them against the outdated libvpx, what I try to do at the moment
with Firefox.

However, Firfox allowed me to install the wrong version and didn't
start.

$ pacman -Qi firefox | grep On
Depends On     : [snip] libvpx [snip]
                        ^^^^^^
                        No pointer to a dedicated version

So I'm aware that the Virtualmachine packages, the libvpx and 2 ffmpeg
packages for good reasons aren't up to date.

I didn't notice that Firefox needs the up to date version of libvpx
too. I wonder if there's a way to list all packages that depend on a
dedicated version of another package.

Regards,
Ralf