diff --git a/cpu.m/memcpy.c b/cpu.m/memcpy.c
index 5e8dde6..b52932b 100644
--- a/cpu.m/memcpy.c
+++ b/cpu.m/memcpy.c
@@ -9,7 +9,9 @@
 
 #include <sys/resource.h>
 #include <sys/time.h>
+#include <inttypes.h>
 #include <pthread.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -44,11 +46,17 @@
 void PrUsage (struct rusage *r)
 {
 	if (!resource_usage) return;
-	printf("utime = %ld.%06ld stime = %ld.%06ld minflt = %ld\n",
-		 r->ru_utime.tv_sec,
-		 (long)r->ru_utime.tv_usec,
-		 r->ru_stime.tv_sec,
-		 (long)r->ru_stime.tv_usec,
+	/* We cannot use 'long' as some 32bit systems define time_t as
+	 * as 64bit value.  Others define it as a 32bit value.  So we
+	 * have to explicitly cast it ourselves to get a stable printf
+	 * format string.
+	 */
+	printf("utime = %"PRIu64".%06"PRIu64" stime = %"PRIu64".%06"PRIu64" "
+		 "minflt = %ld\n",
+		 (uint64_t)r->ru_utime.tv_sec,
+		 (uint64_t)r->ru_utime.tv_usec,
+		 (uint64_t)r->ru_stime.tv_sec,
+		 (uint64_t)r->ru_stime.tv_usec,
 		 r->ru_minflt);
 #if 0
 		 struct timeval ru_utime; /* user time used */
diff --git a/file.m/timer.c b/file.m/timer.c
index d84cb97..23572ac 100644
--- a/file.m/timer.c
+++ b/file.m/timer.c
@@ -12,6 +12,8 @@
  +-------------------------------------------------------------------------*/
 
 #include <sys/time.h>
+#include <inttypes.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
@@ -81,9 +83,17 @@
 static void printTimer (Timer_s *timer)
 {
 	if (timer->key == 0) return;
-	printf("%8p: start=%ld.%.6ld delta=%ld.%.6ld\n", timer->key,
-				timer->start.tv_sec, (long)timer->start.tv_usec,
-				timer->delta.tv_sec, (long)timer->delta.tv_usec);
+	/* We cannot use 'long' as some 32bit systems define time_t as
+	 * as 64bit value.  Others define it as a 32bit value.  So we
+	 * have to explicitly cast it ourselves to get a stable printf
+	 * format string.
+	 */
+	printf("%8p: start=%"PRIu64".%.6"PRIu64" delta=%"PRIu64".%.6"PRIu64"\n",
+				timer->key,
+				(uint64_t)timer->start.tv_sec,
+				(uint64_t)timer->start.tv_usec,
+				(uint64_t)timer->delta.tv_sec,
+				(uint64_t)timer->delta.tv_usec);
 }
 
 void dumpTimersReverse (void)
diff --git a/libpuny.b/file.c b/libpuny.b/file.c
index a59ec94..3e4f11e 100644
--- a/libpuny.b/file.c
+++ b/libpuny.b/file.c
@@ -107,13 +107,7 @@
 		io_error("write", NULL);
 	}
 	if (rc != nbytes) {
-#ifdef __APPLE__
-		fprintf(stderr, "ERROR: write: wrote only %ld bytes of %ld\n",
-#elif __x86_64__
-		fprintf(stderr, "ERROR: write: wrote only %ld bytes of %ld\n",
-#else
-		fprintf(stderr, "ERROR: write: wrote only %d bytes of %d\n",
-#endif
+		fprintf(stderr, "ERROR: write: wrote only %zi bytes of %zu\n",
 			rc, nbytes);
 		exit(1);
 	}