It works! Kind of.
There's definitely option overload in the main menu (the screenshot with horizontal lines, they are clickable though require a bit of patience), not sure how hard it would be to spread the options into two/three submenus. Some of the editable text fields also behave a bit wonky (display text once you start editing it).
Used libQtDesigner.so's from ubuntu (maemo's 4.5.3 complained on startup when loading few plugins, libqthelp seems to be working), to build you'll also need QtHelp/QtDesigner folders in /usr/include (used the ones from here: http://portal.nersc.gov/svn/visit/ta...4.7.4/include/).
You can put the softfp cflag in /usr/share/qt4/mkspecs/linux-g++-maemo5/qmake.conf to not have to edit each makefile qmake creates.
Had to use g++ 4.2, mangling of va_lists which usually is just a mildly irritating warning, here results in errors. The garage version of libqt4-dev doesn't install nicely on CSSU (depends = 4.7.0), but still works after dpkg, one just needs to update symlinks in /usr/lib. Building version 2.1.0 on non-overclocked device takes some 18 hours.