Index: Headers/GNUstepBase/GSBlocks.h
===================================================================
--- Headers/GNUstepBase/GSBlocks.h	(revision 38268)
+++ Headers/GNUstepBase/GSBlocks.h	(working copy)
@@ -117,8 +117,8 @@
  * by an application.
  */
 
-void *_Block_copy(void *) __attribute__((weak));
-void _Block_release(void *) __attribute__((weak));
+void *_Block_copy(const void *) __attribute__((weak));
+void _Block_release(const void *) __attribute__((weak));
 
 #ifdef __cplusplus
 }