The hello0.t example program does not
display its greeting on some Linux systems. This is because some Curses
libraries under Linux do not seem to update the screen when refreshing
just before exiting. IMO this is a bug.
As a work-around, add con.getkey(); before
con.shutdown(); in the hello0.t
program and in all other programs that do not display their
final output. con.pollkey(); may also
work (and not require to press a key), but I cannot test this
because I have no Linux system.