diff --git a/ChangeLog b/ChangeLog
index a9c0a61a6..d9c9f5070 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2003-11-16 Richard Frith-Macdonald <rfm@gnu.org>
+
+	* Source/Additions/GSCompatibility.m: Add dummy gcFinalize
+	implementations for NSLock and NSRecursiveLock so that the
+	lazy locking classes can safely call them under MacOS-X
+
 2003-11-10 Richard Frith-Macdonald <rfm@gnu.org>
 
 	* Tools/AGSHtml.m: Fix based on email by Chris Vetter to correct
diff --git a/Source/Additions/GSCompatibility.m b/Source/Additions/GSCompatibility.m
index ee77c61d9..397dbc0d2 100644
--- a/Source/Additions/GSCompatibility.m
+++ b/Source/Additions/GSCompatibility.m
@@ -471,3 +471,23 @@ BOOL GSDebugSet(NSString *level)
 }
 
 @end
+
+@implementation	NSLock (GSCompatibility)
+/*
+ * Dummy implementation of garbage collection cleanup method called by
+ * GSLazyLock on deallocation.
+ */
+- (void) gcFinalize
+{
+}
+@end
+
+@implementation	NSRecursiveLock (GSCompatibility)
+/*
+ * Dummy implementation of garbage collection cleanup method called by
+ * GSLazyRecursiveLock on deallocation.
+ */
+- (void) gcFinalize
+{
+}
+@end