Hi,
I got this error with RawTherapee. I followed your hint, but was no libtiff in the main repository. I went to libjpeg and changed its source from the main repository to the graphics repository. It helped.
Maybe this will help others.
# zypper if libtiff*
Loading repository data...
Reading installed packages...
[ ... ]
Information for package libtiff6:
---------------------------------
Repository : openSUSE-Tumbleweed-Oss
Name : libtiff6
Version : 4.6.0-4.2
Arch : x86_64
Vendor : openSUSE
Installed Size : 580.1 KiB
Installed : Yes (automatically)
Status : up-to-date
Source package : tiff-4.6.0-4.2.src
Upstream URL : https://libtiff.gitlab.io/libtiff/
Summary : The Tiff Library (with JPEG and compression support)
Description :
This package includes the tiff libraries. To link a program with
libtiff, you will have to add -ljpeg and -lz to include the necessary
libjpeg and libz in the linking process.
#