@@ -6,10 +6,13 @@
  *
  * 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 included in
  * the packaging of this file.
  */
+
+/* Required to prevent a name conflict in glibc when using -fblocks */
+#undef __USE_XOPEN
 
 #include <unistd.h>
 
 #import "OFStream.h"