Index: src/OFUDPSocket.h
==================================================================
--- src/OFUDPSocket.h
+++ src/OFUDPSocket.h
@@ -30,10 +30,11 @@
 typedef struct {
 	struct sockaddr_storage address;
 	socklen_t length;
 } of_udp_socket_address_t;
 
+#ifdef OF_HAVE_BLOCKS
 /*!
  * @brief A block which is called when the host / port pair for the UDP socket
  *	  has been resolved.
  *
  * @param host The host that has been resolved
@@ -57,10 +58,11 @@
  * @return A bool whether the same block should be used for the next receive
  */
 typedef bool (^of_udp_socket_async_receive_block_t)(OFUDPSocket *socket,
     void *buffer, size_t length, of_udp_socket_address_t sender,
     OFException *exception);
+#endif
 
 /*!
  * @brief A class which provides functions to create and use UDP sockets.
  *
  * Addresses are of type @ref of_udp_socket_address_t. You can use @ref

Index: src/OFUDPSocket.m
==================================================================
--- src/OFUDPSocket.m
+++ src/OFUDPSocket.m
@@ -133,12 +133,12 @@
 	[self join];
 
 # ifdef OF_HAVE_BLOCKS
 	if (_block != NULL)
 		_block(_host, _port, _address, _exception);
-# endif
 	else {
+# endif
 		void (*func)(id, SEL, OFString*, uint16_t,
 		    of_udp_socket_address_t, OFException*) =
 		    (void(*)(id, SEL, OFString*, uint16_t,
 		    of_udp_socket_address_t, OFException*))[_target
 		    methodForSelector: _selector];

Index: src/resolver.m
==================================================================
--- src/resolver.m
+++ src/resolver.m
@@ -261,12 +261,10 @@
 
 # if OF_HAVE_THREADS
 	if (!of_mutex_unlock(&mutex))
 		@throw [OFUnlockFailedException exception];
 # endif
-
-	return ret;
 #endif
 }
 
 void
 of_resolver_free(of_resolver_result_t **results)