gegl issue when doing rev-update

[Bill Cole]

On 12 Nov 2018, at 8:57, Riccardo Mottola via macports-users wrote:

> Hi,
>
> On 2018-11-09 18:43:56 +0100 Ken Cunningham 
> <ken.cunningham.webuse at gmail.com> wrote:
>
>> openexr was updated a few days ago
>>
>> the new library version is  /opt/local/lib/libIlmImf-2_3.24.dylib
>>
>> it looks like gegl (gegl-0.2) is gone now. Not sure where or when it 
>> went.
>>
>> there is gegl-0.3, gegl-.04, and gegl-devel.
>>
>> You should most likely uninstall gegl, and install one of the others.
>
>
> This is what I have :
>
> $ port installed | grep gegl
>   gegl @0.2.0-20180218_2+quartz (active)
>   gegl-0.4 @0.4.0_0+quartz
>   gegl-0.4 @0.4.2_0+quartz
>   gegl-0.4 @0.4.6_1+quartz
>   gegl-0.4 @0.4.8_0+quartz
>   gegl-0.4 @0.4.12_1+quartz
>   gegl-0.4 @0.4.12_2+quartz (active)
>
>
> how can I try uninstalling gegl-0.2 without causing issues? I notice 
> it is the active "gegl" without version suffix.

Which would reflect a port maintenance bug, if you were using a current 
version of the ports tree. 'gegl' without a suffix is no longer present 
in the ports tree.

>
> If I try to uninstall gegl:
> $ sudo port uninstall gegl
> Note: It is not recommended to uninstall/deactivate a port that has 
> dependents as it breaks the dependents.
> The following ports will break: gimp2 @2.8.22_2
>
> I wonder if it is correct and ig gimp2 is using gegl-0.4 or generic 
> "gegl" and by that the 0.2 version.

It might be. That's an obsolete version of Gimp, so maybe it needs an 
obsolete GEGL. That doesn't make much sense if you also have a newer 
version of GEGL, since the two are intimately connected and the only 
other port that requires GEGL is 'gnome-photos' and it currently 
requires 'gegl-0.3' specifically.

If you update to the current version of the 'gimp' port (or of 'gimp2' 
if you don't have the 'gimp' meta-port installed) you will get the 
latest version of the 'gegl-0.4' port installed as a dependency.

> Is this actually the expected situation? I would have thought I could 
> have older versions, but they should be versioned and that only latest 
> would have no version.

No, that's not how it works. You cannot rely on the current ports tree 
always following that rule in all cases. This is particularly true for 
libraries that are being actively developed, because some dependents may 
not work with the latest version of the library while others are updated 
to require it.

To fix this, you should update your ports tree ('port sync' or 'port 
selfupdate') and then 'gimp' (or 'gimp2' if you don't have the 'gimp' 
meta-port installed) and 'port reclaim' when finished to clean up any of 
the old useless versions.