usage of the system() function is not recommended.

[felipesanches]

"There are serious security concerns (what if a maalicious user replaces the clear program?)."

More insight here:
http://faq.cprogramming.com/cgi-bin/smartfaq.cgi?answer=1031963460&id=1043284385

I tend to think it would be good to use the Curses library.

[vampirefrog]

Can you please implement the code to load libcurses with dlopen, and call its clear function? Keep libcurses open for the duration of the program. if libcurses is not found, use system("clear") as a fallback.