ncurses blink effekt

[ncurses1]

[code]
for(;;)
{
move(LINES/2,COLS/2);
printf("The whole screen is blinking flashing ");
refresh();
flash();
sleep(1);
}
[code]
resultiert wenn ich

gcc file.c -lncurses -o file

gdb ./file

zu
[code]
Program received signal SIGSEGV, Segmentation fault.
0xb7edc0ef in flash () from /lib/libncurses.so.5
(gdb)
[/code]

ncurses.h werden inkludiert...