#include <sstream>
#else
#include <strstream>
-#define istringstream(x) istrstream (x, length ())
#endif
using namespace std;
#include "misc.hh"
#include "warn.hh"
+#if HAVE_SSTREAM
+using std::istringstream;
+#else
+#define istringstream(x) std::istrstream (x, length ())
+#endif
+
+using std::istream;
+using std::string;
+using std::vector;
+
void
Source_file::load_stdin ()
{