Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -639,11 +639,14 @@
 esac
 
 AC_CHECK_FUNCS(_Unwind_Backtrace)
 
 AC_CHECK_FUNC(objc_autoreleasePoolPush, [], [
-	AC_SUBST(AUTORELEASE_M, "autorelease.m")
+	AC_SUBST(RUNTIME_AUTORELEASE_M, "runtime/autorelease.m")
+])
+AC_CHECK_FUNC(objc_constructInstance, [], [
+	AC_SUBST(RUNTIME_INSTANCE_M, "runtime/instance.m")
 ])
 
 case "$host_os" in
 	darwin*)
 		AC_SUBST(LDFLAGS_REEXPORT, ["-Wl,-reexport-lobjfw"])

Index: extra.mk.in
==================================================================
--- extra.mk.in
+++ extra.mk.in
@@ -15,11 +15,10 @@
 
 OBJFWBRIDGE_SHARED_LIB = @OBJFWBRIDGE_SHARED_LIB@
 OBJFWBRIDGE_STATIC_LIB = @OBJFWBRIDGE_STATIC_LIB@
 OBJFWBRIDGE_FRAMEWORK = @OBJFWBRIDGE_FRAMEWORK@
 
-AUTORELEASE_M = @AUTORELEASE_M@
 BIN_PREFIX = @BIN_PREFIX@
 BRIDGE = @BRIDGE@
 CVINCLUDE_INLINE_H = @CVINCLUDE_INLINE_H@
 ENCODINGS = @ENCODINGS@
 ENCODINGS_A = @ENCODINGS_A@
@@ -34,11 +33,10 @@
 FISH_COMPLETIONS = @FISH_COMPLETIONS@
 FORWARDING_A = @FORWARDING_A@
 FORWARDING_FORWARDING_A = @FORWARDING_FORWARDING_A@
 FORWARDING_FORWARDING_LIB_A = @FORWARDING_FORWARDING_LIB_A@
 FORWARDING_LIB_A = @FORWARDING_LIB_A@
-INSTANCE_M = @INSTANCE_M@
 INVOCATION_A = @INVOCATION_A@
 INVOCATION_INVOCATION_A = @INVOCATION_INVOCATION_A@
 INVOCATION_INVOCATION_LIB_A = @INVOCATION_INVOCATION_LIB_A@
 INVOCATION_LIB_A = @INVOCATION_LIB_A@
 LIBBASES_M = @LIBBASES_M@
@@ -66,11 +64,13 @@
 OF_SCTP_SOCKET_M = @OF_SCTP_SOCKET_M@
 OF_SELECT_KERNEL_EVENT_OBSERVER_M = @OF_SELECT_KERNEL_EVENT_OBSERVER_M@
 REEXPORT_RUNTIME = @REEXPORT_RUNTIME@
 REEXPORT_RUNTIME_FRAMEWORK = @REEXPORT_RUNTIME_FRAMEWORK@
 RUNTIME = @RUNTIME@
+RUNTIME_AUTORELEASE_M = @RUNTIME_AUTORELEASE_M@
 RUNTIME_FRAMEWORK_LIBS = @RUNTIME_FRAMEWORK_LIBS@
+RUNTIME_INSTANCE_M = @RUNTIME_INSTANCE_M@
 RUNTIME_LIBS = @RUNTIME_LIBS@
 RUN_TESTS = @RUN_TESTS@
 SFDC_INLINE_H = @SFDC_INLINE_H@
 SFDC_TARGET = @SFDC_TARGET@
 SFD_FILE = @SFD_FILE@

Index: src/Makefile
==================================================================
--- src/Makefile
+++ src/Makefile
@@ -212,11 +212,13 @@
 	OFRangeCharacterSet.m		\
 	OFRangeValue.m			\
 	OFRectangleValue.m		\
 	OFSubarray.m			\
 	OFUTF8String.m			\
-	${LIBBASES_M}
+	${LIBBASES_M}			\
+	${RUNTIME_AUTORELEASE_M}	\
+	${RUNTIME_INSTANCE_M}
 SRCS_FILES += OFFileURLHandler.m	\
 	      OFINIFileSettings.m
 SRCS_SOCKETS += OFDNSResolverSettings.m			\
 		OFHTTPURLHandler.m			\
 		OFHostAddressResolver.m			\

Index: src/OFObject.h
==================================================================
--- src/OFObject.h
+++ src/OFObject.h
@@ -1330,10 +1330,15 @@
 extern "C" {
 #endif
 #ifdef OF_APPLE_RUNTIME
 extern void *_Null_unspecified objc_autoreleasePoolPush(void);
 extern void objc_autoreleasePoolPop(void *_Null_unspecified pool);
+# ifndef __OBJC2__
+extern id _Nullable objc_constructInstance(Class _Nullable class_,
+    void *_Nullable bytes);
+extern void *_Nullable objc_destructInstance(id _Nullable object);
+# endif
 #endif
 extern id of_alloc_object(Class class_, size_t extraSize,
     size_t extraAlignment, void *_Nullable *_Nullable extra);
 extern void OF_NO_RETURN_FUNC of_method_not_found(id self, SEL _cmd);
 extern uint32_t of_hash_seed;

Index: src/runtime/autorelease.m
==================================================================
--- src/runtime/autorelease.m
+++ src/runtime/autorelease.m
@@ -18,16 +18,26 @@
 #include "config.h"
 
 #include <stdio.h>
 #include <stdlib.h>
 
-#import "ObjFWRT.h"
-#import "private.h"
+#ifdef OF_OBJFW_RUNTIME
+# import "ObjFWRT.h"
+# import "private.h"
+#else
+# import <objc/runtime.h>
+#endif
 
 #if !defined(OF_HAVE_COMPILER_TLS) && defined(OF_HAVE_THREADS)
 # import "tlskey.h"
 #endif
+
+#ifndef OF_OBJFW_RUNTIME
+@interface DummyObject
+- (void)release;
+@end
+#endif
 
 #if defined(OF_HAVE_COMPILER_TLS)
 static thread_local id *objects = NULL;
 static thread_local uintptr_t count = 0;
 static thread_local uintptr_t size = 0;

Index: src/runtime/instance.m
==================================================================
--- src/runtime/instance.m
+++ src/runtime/instance.m
@@ -15,12 +15,18 @@
  * file.
  */
 
 #include "config.h"
 
-#import "ObjFWRT.h"
-#import "private.h"
+#include <stdbool.h>
+
+#ifdef OF_OBJFW_RUNTIME
+# import "ObjFWRT.h"
+# import "private.h"
+#else
+# import <objc/runtime.h>
+#endif
 
 static SEL constructSelector = NULL;
 static SEL destructSelector = NULL;
 
 static bool