Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -73,12 +73,10 @@
 	AC_MSG_RESULT(yes)
 	], [
 	AC_MSG_RESULT(no)
 	OBJCFLAGS="$old_OBJCFLAGS"
 	])
-AC_CHECK_FUNC(_Block_copy,
-	AC_DEFINE(HAVE_BLOCK_COPY, 1, [Whether we have _Block_copy]))
 
 AC_CHECK_HEADERS([objfw-rt.h objc/objc.h])
 
 test x"$ac_cv_header_objfw_rt_h" = x"yes" && objc_runtime="ObjFW-RT"
 

Index: src/OFBlock.m
==================================================================
--- src/OFBlock.m
+++ src/OFBlock.m
@@ -130,11 +130,10 @@
 extern void *_NSConcreteStackBlock;
 extern void *_NSConcreteGlobalBlock;
 extern void *_NSConcreteMallocBlock;
 #endif
 
-#ifndef HAVE_BLOCK_COPY
 static struct {
 	Class isa;
 } alloc_failed_exception;
 
 void*
@@ -246,11 +245,10 @@
 			free(obj);
 		}
 		break;
 	}
 }
-#endif
 
 /// \cond internal
 @implementation OFBlock
 #if defined(OF_APPLE_RUNTIME) && !defined(__OBJC2__)
 + (void)load