bug#57742: QT plugins from profile not found (QT_PLUGIN_PATH)

[Maxim Cournoyer <maxim.cournoyer@gmail.com>]

Hi,

Antero Mejr <antero@mailbox.org> writes:

> This allows extension of QT_PLUGIN_PATH.
> QT programs will now work under Wayland when qt-wayland is installed.
>
> * guix/build/qt-utils.scm (variables-for-wrapping)[QT_PLUGIN_PATH]: Add prefix
> value to 'wrap-program' procedure call for QT_PLUGIN_PATH variable.
> ---
> Tested using Wayland and X (via XWayland), using plugin paths for QT5, QT6, or
> both. In all cases, QT selects the correct plugin if it's present anywhere in
> QT_PLUGIN_PATH.
>
>  guix/build/qt-utils.scm | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/guix/build/qt-utils.scm b/guix/build/qt-utils.scm
> index 2e47f1bc02..b503659521 100644
> --- a/guix/build/qt-utils.scm
> +++ b/guix/build/qt-utils.scm
> @@ -89,7 +89,7 @@ (define exists? (match file-type
>      '("XDG_CONFIG_DIRS" suffix directory "/etc/xdg")
>      ;; We wrap exactly to avoid potentially mixing Qt5/Qt6 components, which
>      ;; would cause warnings, perhaps problems.
> -    `("QT_PLUGIN_PATH" = directory
> +    `("QT_PLUGIN_PATH" prefix directory
>        ,(format #f "/lib/qt~a/plugins" qt-major-version))
>      `("QML2_IMPORT_PATH" = directory
>        ,(format #f "/lib/qt~a/qml" qt-major-version))

Already fixed on my staging :-).

I'll merge staging into master as soon as it catches up to master
according to https://ci.guix.gnu.org/.  Help welcome!

-- 
Thanks,
Maxim