Index: src/OFSeekableStream.h
==================================================================
--- src/OFSeekableStream.h
+++ src/OFSeekableStream.h
@@ -12,14 +12,11 @@
  * 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.
  */
 
-/* Required to prevent a name conflict in glibc when using -fblocks */
-#undef __USE_XOPEN
-
-#include <unistd.h>
+#include <sys/types.h>
 
 #import "OFStream.h"
 
 /**
  * \brief A stream that supports seeking.