Hi,
Matthias Heil wrote in Neurodebian-devel list in Nov 2015 about the problem with unmet dependency of fslview in Debian 9. I got in some dependency troubles, which I decided to solve by upgrading to Debian Strech. However, I got stuck as well.
The problem is that fsl (and fslview) is compiled against libstdc++5, but only libstdc++6 is available on newer system. Would it be possible to provide updated package(s) - for me especially fslview, linked with libstdc++6 ? I think that this problem is still unsolved.