Index: src/OFSystemInfo+NetworkInterfaces.m
==================================================================
--- src/OFSystemInfo+NetworkInterfaces.m
+++ src/OFSystemInfo+NetworkInterfaces.m
@@ -15,28 +15,12 @@
 
 #include "config.h"
 
 #import "OFSystemInfo.h"
 
-OFNetworkInterfaceKey OFNetworkInterfaceIndex = @"OFNetworkInterfaceIndex";
-OFNetworkInterfaceKey OFNetworkInterfaceHardwareAddress =
-    @"OFNetworkInterfaceHardwareAddress";
-OFNetworkInterfaceKey OFNetworkInterfaceIPv4Addresses =
-    @"OFNetworkInterfaceIPv4Addresses";
-#ifdef OF_HAVE_IPV6
-OFNetworkInterfaceKey OFNetworkInterfaceIPv6Addresses =
-    @"OFNetworkInterfaceIPv6Addresses";
-#endif
-#ifdef OF_HAVE_IPX
-OFNetworkInterfaceKey OFNetworkInterfaceIPXAddresses =
-    @"OFNetworkInterfaceIPXAddresses";
-#endif
-#ifdef OF_HAVE_APPLETALK
-OFNetworkInterfaceKey OFNetworkInterfaceAppleTalkAddresses =
-    @"OFNetworkInterfaceAppleTalkAddresses";
-#endif
+#include "OFSystemInfo+NetworkInterfacesConstants.inc"
 
 #ifdef OF_WINDOWS
 # include "platform/Windows/OFSystemInfo+NetworkInterfaces.m"
 #else
 # include "platform/POSIX/OFSystemInfo+NetworkInterfaces.m"
 #endif

ADDED   src/OFSystemInfo+NetworkInterfacesConstants.inc
Index: src/OFSystemInfo+NetworkInterfacesConstants.inc
==================================================================
--- src/OFSystemInfo+NetworkInterfacesConstants.inc
+++ src/OFSystemInfo+NetworkInterfacesConstants.inc
@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2008-2023 Jonathan Schleifer <js@nil.im>
+ *
+ * All rights reserved.
+ *
+ * This file is part of ObjFW. It may be distributed under the terms of the
+ * Q Public License 1.0, which can be found in the file LICENSE.QPL included in
+ * the packaging of this file.
+ *
+ * Alternatively, it may be distributed under the terms of the GNU General
+ * Public License, either version 2 or 3, which can be found in the file
+ * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
+ * file.
+ */
+
+#include "config.h"
+
+#import "OFSystemInfo.h"
+
+OFNetworkInterfaceKey OFNetworkInterfaceIndex = @"OFNetworkInterfaceIndex";
+OFNetworkInterfaceKey OFNetworkInterfaceHardwareAddress =
+    @"OFNetworkInterfaceHardwareAddress";
+OFNetworkInterfaceKey OFNetworkInterfaceIPv4Addresses =
+    @"OFNetworkInterfaceIPv4Addresses";
+#ifdef OF_HAVE_IPV6
+OFNetworkInterfaceKey OFNetworkInterfaceIPv6Addresses =
+    @"OFNetworkInterfaceIPv6Addresses";
+#endif
+#ifdef OF_HAVE_IPX
+OFNetworkInterfaceKey OFNetworkInterfaceIPXAddresses =
+    @"OFNetworkInterfaceIPXAddresses";
+#endif
+#ifdef OF_HAVE_APPLETALK
+OFNetworkInterfaceKey OFNetworkInterfaceAppleTalkAddresses =
+    @"OFNetworkInterfaceAppleTalkAddresses";
+#endif

Index: src/linklib/init.m
==================================================================
--- src/linklib/init.m
+++ src/linklib/init.m
@@ -264,10 +264,13 @@
 void *__objc_class_name_OFThreadStillRunningException;
 void *__objc_class_name_OFWaitForConditionFailedException;
 #endif
 #include "OFFileManagerConstants.inc"
 #include "OFRunLoopConstants.inc"
+#ifdef OF_HAVE_SOCKETS
+# include "OFSystemInfo+NetworkInterfacesConstants.inc"
+#endif
 /* The following __objc_class_name_* are only for the tests. */
 void *__objc_class_name_OFBitSetCharacterSet;
 void *__objc_class_name_OFConcreteMutableSet;
 void *__objc_class_name_OFConcreteSet;
 void *__objc_class_name_OFMutableUTF8String;