There seems to be a problem with ncurses 5.6
http://www.haskell.org/pipermail/glasgow-haskell-users/2008-July/015044.html
We have Version 5.0.3.
You may try (originally for
SunOS leo 5.10 Generic_137111-02 sun4u sparc SUNW,Sun-Fire-280R) from
http://www.informatik.uni-bremen.de/agbkb/forschung/formal_methods/CoFI/hets/solaris/ghcs/libncurses.so.5.0.3