@@ -16,10 +16,12 @@
 
 #include "config.h"
 
 #define __NO_EXT_QNX
 
+#include <stdlib.h>
+
 #include <unistd.h>
 
 #include <assert.h>
 
 #import "OFStreamObserver.h"
@@ -43,11 +45,10 @@
 #if defined(HAVE_SYS_SELECT_H) || defined(_WIN32)
 # import "OFStreamObserver_select.h"
 #endif
 
 #import "OFInitializationFailedException.h"
-#import "OFNotImplementedException.h"
 #import "OFOutOfRangeException.h"
 
 #import "autorelease.h"
 #import "macros.h"
 
@@ -263,30 +264,30 @@
 #endif
 }
 
 - (void)OF_addFileDescriptorForReading: (int)fd
 {
-	@throw [OFNotImplementedException exceptionWithClass: [self class]
-						    selector: _cmd];
+	[self doesNotRecognizeSelector: _cmd];
+	abort();
 }
 
 - (void)OF_addFileDescriptorForWriting: (int)fd
 {
-	@throw [OFNotImplementedException exceptionWithClass: [self class]
-						    selector: _cmd];
+	[self doesNotRecognizeSelector: _cmd];
+	abort();
 }
 
 - (void)OF_removeFileDescriptorForReading: (int)fd
 {
-	@throw [OFNotImplementedException exceptionWithClass: [self class]
-						    selector: _cmd];
+	[self doesNotRecognizeSelector: _cmd];
+	abort();
 }
 
 - (void)OF_removeFileDescriptorForWriting: (int)fd
 {
-	@throw [OFNotImplementedException exceptionWithClass: [self class]
-						    selector: _cmd];
+	[self doesNotRecognizeSelector: _cmd];
+	abort();
 }
 
 - (void)OF_processQueue
 {
 	[mutex lock];
@@ -361,12 +362,12 @@
 	[self observeWithTimeout: -1];
 }
 
 - (BOOL)observeWithTimeout: (double)timeout
 {
-	@throw [OFNotImplementedException exceptionWithClass: [self class]
-						    selector: _cmd];
+	[self doesNotRecognizeSelector: _cmd];
+	abort();
 }
 
 - (void)cancel
 {
 #ifndef _WIN32