I did all updates for slackware-x86_64.

Now I have a problem with gphoto2 -L

With version 2.52.2 the result is :
Le dossier «*/*» ne contient aucun fichier.
Le dossier «*/store_00010001*» contient 1*fichier.
#1 IMG_9157.JPG rd 1074 KB 2592x1944 image/jpeg
Le dossier «*/store_00010001/191CANON*» contient 1*fichier.
#2 IMG_9157.JPG rd 1074 KB 2592x1944 image/jpeg
Le dossier «*/store_00010001/DCIM*» ne contient aucun fichier.
Le dossier «*/store_00010001/DCIM/191CANON*» contient 1*fichier.
#3 IMG_9157.JPG rd 1074 KB 2592x1944 image/jpeg
Le dossier «*/store_00010001/MISC*» ne contient aucun fichier.
Le dossier «*/store_80000001*» ne contient aucun fichier.

I have three time the same photo.
If i return to version 2.4.14 the result is correct :

Il n'y a pas de fichier dans le dossier '/'.
Il n'y a pas de fichier dans le dossier '/store_00010001'.
Il n'y a pas de fichier dans le dossier '/store_00010001/DCIM'.
Il y a 1 fichier dans ce dossier '/store_00010001/DCIM/191CANON'.
#1 IMG_9157.JPG rd 1074 KB 2592x1944 image/jpeg
Il n'y a pas de fichier dans le dossier '/store_00010001/MISC'.
Il n'y a pas de fichier dans le dossier '/store_80000001'.

I have reformated the card to be sure the problem is not in the camera.
Perhaps I did a big error.
Has anybody a solution

Thanks

Assuming you upgraded both gphoto2 and libgphoto2 together, I can't imagine you did anything wrong to get that. It looks like gphoto2 -L is seriously messed up. Your 2nd entry /store_00010001/191CANON isn't even a valid path according to the standard. What kind of Canon camera is this? (Looks like it has internal memory plus a memory card, and I didn't think Canon did that.)

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My camera is a Canon Powershot A95 and up to now i has no problem
with gphoto2.

I had updated libgphoto2 and gphoto2.

That's a pretty old camera - 9 years ago. (It uses a CF card and has no built-in memory so I have no idea what /store_80000001 is). I'm finding it hard to believe that this could be something Slackware did, so you might want to try opening a gphoto2 bug report at http://sourceforge.net/p/gphoto/bugs/ or try their mailing list (I searched both places and didn't see anything relevant).