@@ -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"])