sloved raspberryPI compile time error

sdr/uhd_io.cpp

@@ -308,7 +308,7 @@ int main(int /*argc*/, char * /*argv*/[])
 			}
 
 			if (++pc % 1000==0) {
-				int64_t full_secs;
+				time_t full_secs;
 				double frac_secs;
 				uhd_rx_metadata_time_spec(rx_meta, &full_secs, &frac_secs);
 				fprintf(stderr, "Received packet: %zu samples, %lf full secs, %lf frac secs, maxv = %lf\n",