diff --git a/7.3.021 b/7.3.021
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+To: vim-dev@vim.org
+Subject: Patch 7.3.021
+Fcc: outbox
+From: Bram Moolenaar <Bram@moolenaar.net>
+Mime-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+------------
+
+Patch 7.3.021
+Problem:    Conflict for defining Boolean in Mac header files.
+Solution:   Define NO_X11_INCLUDES. (Rainer Muller)
+Files:	    src/os_macosx.m, src/vim.h
+
+
+*** ../vim-7.3.020/src/os_macosx.m	2010-08-15 21:57:29.000000000 +0200
+--- src/os_macosx.m	2010-10-10 17:01:55.000000000 +0200
+***************
+*** 15,20 ****
+--- 15,24 ----
+      Error: MACOS 9 is no longer supported in Vim 7
+  #endif
+  
++ /* Avoid a conflict for the definition of Boolean between Mac header files and
++  * X11 header files. */
++ #define NO_X11_INCLUDES
++ 
+  #include "vim.h"
+  #import <Cocoa/Cocoa.h>
+  
+*** ../vim-7.3.020/src/vim.h	2010-08-15 21:57:29.000000000 +0200
+--- src/vim.h	2010-10-10 17:02:56.000000000 +0200
+***************
+*** 192,199 ****
+  #endif
+  
+  #ifdef NO_X11_INCLUDES
+!     /* In os_mac_conv.c NO_X11_INCLUDES is defined to avoid X11 headers.
+!      * Disable all X11 related things to avoid conflicts. */
+  # ifdef FEAT_X11
+  #  undef FEAT_X11
+  # endif
+--- 192,199 ----
+  #endif
+  
+  #ifdef NO_X11_INCLUDES
+!     /* In os_mac_conv.c and os_macosx.m NO_X11_INCLUDES is defined to avoid
+!      * X11 headers.  Disable all X11 related things to avoid conflicts. */
+  # ifdef FEAT_X11
+  #  undef FEAT_X11
+  # endif
+*** ../vim-7.3.020/src/version.c	2010-10-09 17:21:42.000000000 +0200
+--- src/version.c	2010-10-10 17:05:19.000000000 +0200
+***************
+*** 716,717 ****
+--- 716,719 ----
+  {   /* Add new patch number below this line */
++ /**/
++     21,
+  /**/
+
+-- 
+hundred-and-one symptoms of being an internet addict:
+259. When you enter your name in the AltaVista search engine, the top ten
+     matches do indeed refer to you.
+
+ /// Bram Moolenaar -- Bram@Moolenaar.net -- http://www.Moolenaar.net   \\\
+///        sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ \\\
+\\\        download, build and distribute -- http://www.A-A-P.org        ///
+ \\\            help me help AIDS victims -- http://ICCF-Holland.org    ///