Re: How to handle concurrent QT versions

[Andreas Enge]

Am Wed, Mar 01, 2023 at 09:14:27AM +0100 schrieb Alexander Asteroth:
> guix packages but simply made them compile (after some manual changes to
> the code) in my current environment. If I now run a `guix package -u`
> the libraries (from qtbase) get upgraded from 5.15.5 to 6.3.1 and the
> program fails to run.

Then I suppose that your Qt5 libraries disappear, so that the programs will
not find them; and the newly installed Qt6 libraries will not be of help
(they have a different name and are thus considered, well, different).
To check, you can do "ldd name-of-my-executable", which shows you which
libraries needed by your binary are found or not. So the solution is
to not do a "guix package -u", or to do a
"guix package --do-not-upgrade qtbase qtxxx qtyyy ... -u"
(with a potentially long list of Qt packages in the middle).

It might be easier then to create a separate profile with a manifest only
for your Qt5 development, which you would then avoid to update.
It is something I have not done myself yet, so I will have to refer you
to the documentation.

Andreas