(At least some of the dependencies are available in packages that already exist in the repository.)
Yes, I know.
For example, I found Python - however, I have 2.66 and it needs 2.7. Ok, maybe there is newer one in testing or in other repo. I also have
libjasper and
libstdc++6. However, they are listed in konsole as missing. The others are not in repo. I found some as rpm packages for Fedora, but marked as i686 and I always get warning that they are for i686 platform.
I will probably request Saga in the Package Suggest as you recommended.

PS: forgot to write my system and HW - Dell Latitude E5510 with Intel i3 and Intel graphics, Pclinuxos 2011-6 with KDE4