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The top level file, calc++.cc, poses no problem.
#include <iostream>
#include "calc++-driver.hh"
int
main (int argc, char *argv[])
{
calcxx_driver driver;
for (++argv; argv[0]; ++argv)
if (*argv == std::string ("-p"))
driver.trace_parsing = true;
else if (*argv == std::string ("-s"))
driver.trace_scanning = true;
else if (!driver.parse (*argv))
std::cout << driver.result << std::endl;
}