*/
 #include <errno.h>
 #include <fcntl.h>
+#include <inttypes.h>
 #include <math.h>
 #include <signal.h>
 #include <stdio.h>
                        interval = t2 - t1;
                        offset = (t2 + t1) / 2 - tp;
 
-                       printf("system time: %ld.%ld\n",
+                       printf("system time: %" PRId64 ".%u\n",
                                (pct+2*i)->sec, (pct+2*i)->nsec);
-                       printf("phc    time: %ld.%ld\n",
+                       printf("phc    time: %" PRId64 ".%u\n",
                                (pct+2*i+1)->sec, (pct+2*i+1)->nsec);
-                       printf("system time: %ld.%ld\n",
+                       printf("system time: %" PRId64 ".%u\n",
                                (pct+2*i+2)->sec, (pct+2*i+2)->nsec);
-                       printf("system/phc clock time offset is %ld ns\n"
-                               "system     clock time delay  is %ld ns\n",
+                       printf("system/phc clock time offset is %" PRId64 " ns\n"
+                              "system     clock time delay  is %" PRId64 " ns\n",
                                offset, interval);
                }