I also have recently done an slapt-get --upgrade and thought I'd check if I had the same problem with gtkam, and it turns out I do. During the upgrade I went from version 0.1.14 to 0.1.15. After the upgrade I get this when I run from the command line.
gtkam: error while loading shared libraries: libltdl.so.3: cannot open shared object file: No such file or directory
I tried reinstalling from gslapt, this had worked with wbar when I had a similar problem, but it did not work this time.
I tried downgrading this did not work either, and generated the same error.
I am also showing the same libtools package as Birdman.
Just thought I'd let you know that this problem with Gtkam is not isolated to birdmans machine.