xcode c++ problem

wondering if anyone knows of a working clear screeen command that works with xcode...ive tried a few..but i dont know what will work...

maybe my included libraries are wrong...anyone know?

system("CLR"); ?
clrscr(); ?

system("clear"); works on the terminal...

...but not in xcode, it says Terminal Environment Variable not set. I tried setting the TERM variable (set by adding TERM variable setting to executable thru Xcode) to ansi, and then vt100, but both of those output something like [H[J instead of clearing the terminal. Not sure how to do it with Xcode.