diff --git a/GSFIFO.m b/GSFIFO.m
index 6379d61..e02ec29 100644
--- a/GSFIFO.m
+++ b/GSFIFO.m
@@ -620,10 +620,12 @@ stats(NSTimeInterval ti, uint32_t max, NSTimeInterval *bounds, uint64_t *bands)
       for (i = 0; i < boundsCount; i++)
 	{
           [s appendFormat: @"    up to %g: %llu\n",
-	    waitBoundaries[i], getWaitCounts[i]];
+	    waitBoundaries[i],
+        (unsigned long long)getWaitCounts[i]];
 	}
       [s appendFormat: @"    above %g: %llu\n",
-	waitBoundaries[boundsCount-1], getWaitCounts[boundsCount]];
+	waitBoundaries[boundsCount-1],
+    (unsigned long long)getWaitCounts[boundsCount]];
     }
 }
 
@@ -646,10 +648,12 @@ stats(NSTimeInterval ti, uint32_t max, NSTimeInterval *bounds, uint64_t *bands)
       for (i = 0; i < boundsCount; i++)
 	{
           [s appendFormat: @"    up to %g: %llu\n",
-	    waitBoundaries[i], putWaitCounts[i]];
+	    waitBoundaries[i],
+        (unsigned long long)putWaitCounts[i]];
 	}
       [s appendFormat: @"    above %g: %llu\n",
-	waitBoundaries[boundsCount-1], putWaitCounts[boundsCount]];
+	waitBoundaries[boundsCount-1],
+    (unsigned long long)putWaitCounts[boundsCount]];
     }
 }
 
diff --git a/GSLinkedList.m b/GSLinkedList.m
index 2882972..c60d6d9 100644
--- a/GSLinkedList.m
+++ b/GSLinkedList.m
@@ -29,7 +29,7 @@
 
 - (void) dealloc
 {
-  NSAssert(nil == owner, NSInternalInconsistencyException);
+  NSAssert1(nil == owner, @"%@", NSInternalInconsistencyException);
   [item release];
   [super dealloc];
 }
diff --git a/GSSkipMutableArray.m b/GSSkipMutableArray.m
index 0b3932d..a4283b7 100644
--- a/GSSkipMutableArray.m
+++ b/GSSkipMutableArray.m
@@ -125,7 +125,8 @@ static Class	concreteClass = 0;
     [NSNumber numberWithUnsignedInt: l->count], @"Count",
     self, @"Array", nil, nil];
 
-  reason = [NSString stringWithFormat: @"Index %d is out of range %d (in '%@')",    index, l->count, NSStringFromSelector(sel)];
+  reason = [NSString stringWithFormat: @"Index %lu is out of range %d (in '%@')",
+    (unsigned long)index, l->count, NSStringFromSelector(sel)];
 
   exception = [NSException exceptionWithName: NSRangeException
                                       reason: reason
@@ -276,15 +277,15 @@ static Class	concreteClass = 0;
 	      foo = [[NSMutableString alloc] init];
 	      [foo appendString:
 		[NSString stringWithFormat:
-		  @"\"%p\" [label = \"%p%@ |{ <delta%i> %i | <forward%i> }",
-		  p, p, p == l->header ? @"(HEADER)" : @"", k,
-		  p->forward[k].delta, k]];
+		  @"\"%p\" [label = \"%p%@ |{ <delta%lu> %i | <forward%lu> }",
+		  p, p, p == l->header ? @"(HEADER)" : @"", (unsigned long)k,
+		  p->forward[k].delta, (unsigned long)k]];
 	      if (p != GSISLNil)
 	        [edges addObject:
 		  [NSString stringWithFormat:
-		    @"\"%p\": forward%i -> \"%p\": delta%i;\n",
-		    p, k, p->forward[k].next,
-		    p->forward[k].next == GSISLNil ? 0 : k]];
+		    @"\"%p\": forward%lu -> \"%p\": delta%lu;\n",
+		    p, (unsigned long)k, p->forward[k].next,
+		    p->forward[k].next == GSISLNil ? 0UL : (unsigned long)k]];
 	      [values setObject: foo forKey: value];
 	      [foo release];
 	    }
@@ -292,14 +293,14 @@ static Class	concreteClass = 0;
 	    {
 	      [foo appendString:
 		[NSString stringWithFormat:
-		  @"|{ <delta%i> %i | <forward%i> }",
-		  k, p->forward[k].delta, k]];
+		  @"|{ <delta%lu> %i | <forward%lu> }",
+		  (unsigned long)k, p->forward[k].delta, (unsigned long)k]];
 	      if (p != GSISLNil)
 	        [edges addObject:
 		  [NSString stringWithFormat:
-		    @"\"%p\": forward%i -> \"%p\": delta%i;\n",
-		    p, k, p->forward[k].next,
-		    p->forward[k].next == GSISLNil ? 0 : k]];
+		    @"\"%p\": forward%lu -> \"%p\": delta%lu;\n",
+		    p, (unsigned long)k, p->forward[k].next,
+		    p->forward[k].next == GSISLNil ? 0UL : (unsigned long)k]];
 	      [values setObject: foo forKey: value];
 	    }
 	}
diff --git a/GSThreadPool.m b/GSThreadPool.m
index 4224b59..d75fff8 100644
--- a/GSThreadPool.m
+++ b/GSThreadPool.m
@@ -123,9 +123,12 @@ static GSThreadPool	*shared = nil;
 
   [poolLock lock];
   result = [NSString stringWithFormat:
-    @"%@ queue: %u(%u) threads: %u(%u) active: %u processed: %u",
-    [super description], operations->count, maxOperations,
-    idle->count + live->count, maxThreads, live->count, processed];
+    @"%@ queue: %lu(%lu) threads: %lu(%lu) active: %lu processed: %lu",
+    [super description], (unsigned long)operations->count,
+    (unsigned long)maxOperations,
+    (unsigned long)(idle->count + live->count),
+    (unsigned long)maxThreads, (unsigned long)live->count,
+    (unsigned long)processed];
   [poolLock unlock];
   return result;
 }
diff --git a/GSThroughput.m b/GSThroughput.m
index 11e5061..fc43ccd 100644
--- a/GSThroughput.m
+++ b/GSThroughput.m
@@ -1019,8 +1019,8 @@ typedef struct {
 
 - (void) startDuration: (NSString*)name
 {
-  NSAssert(my->supportDurations == YES && my->started == 0.0,
-    NSInternalInconsistencyException);
+  NSAssert1(my->supportDurations == YES && my->started == 0.0,
+    @"%@", NSInternalInconsistencyException);
   if (my->event != nil)
     {
       [NSException raise: NSInternalInconsistencyException