How to clear the screen in Xcode v10.1

#include <unistd.h>
#include <term.h>

void ClearScreen()
  {
  if (!cur_term)
    {
    int result;
    setupterm( NULL, STDOUT_FILENO, &result );
    if (result <= 0) return;
    }

  putp( tigetstr( "clear" ) );
  }

I use this code in Xcode v10.1 and the debugger said that
"ISO C++11 does not allow conversion from string literal to 'char *' "

what should i do to clean my screen in xcode v10.1 with c++11?

(Source: http://www.cplusplus.com/articles/4z18T05o/#POSIX)