media-libs/jasper library is needed for the game "The Book Of Unwritten Tales" from Steam.
From the console output:
Game update: AppID 215160 "The Book of Unwritten Tales", ProcID 12856, IP 0.0.0.0:0
./bin/32/kAGE: error while loading shared libraries: libjasper.so.1: cannot open shared object file: No such file or directory
output from ldd:
$ ldd ~/.local/share/Steam/SteamApps/common/"The Book of Unwritten Tales"/lib/32/libOgreMain.so.1.7.4 | grep "not found"
libjasper.so.1 => not found
*** This bug has been marked as a duplicate of bug 446682 ***