Index: src/OFPlugin.m
==================================================================
--- src/OFPlugin.m
+++ src/OFPlugin.m
@@ -54,11 +54,11 @@
 		@throw [OFInitializationFailedException
 		    exceptionWithClass: self];
 
 	[pool release];
 
-	initPlugin = (OFPlugin*(*)(void))dlsym(handle, "init_plugin");
+	*(void**)&initPlugin = dlsym(handle, "init_plugin");
 	if (initPlugin == NULL || (plugin = initPlugin()) == nil) {
 		dlclose(handle);
 		@throw [OFInitializationFailedException
 		    exceptionWithClass: self];
 	}

Index: src/OFThread.m
==================================================================
--- src/OFThread.m
+++ src/OFThread.m
@@ -239,11 +239,11 @@
 - initWithBlock: (of_thread_block_t)block_
 	 object: (id)object_
 {
 	self = [super init];
 
-	block = [block_ retain];
+	block = [block_ copy];
 	object = [object_ retain];
 
 	return self;
 }
 #endif

Index: src/OFThreadPool.m
==================================================================
--- src/OFThreadPool.m
+++ src/OFThreadPool.m
@@ -92,11 +92,11 @@
 	 object: (id)object_
 {
 	self = [super init];
 
 	@try {
-		block = [block_ retain];
+		block = [block_ copy];
 		object = [object_ retain];
 	} @catch (id e) {
 		[self release];
 		@throw e;
 	}