This file is part of mingw-cross-env.
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Patch taken from http://sourceforge.net/mailarchive/message.php?msg_id=27995461

mingwrt 3.20 provides ssize_t and defines _SSIZE_T_. This patch
allows libdnet to use this ssize_t instead of defining its
own which causes build failure. Applies to libdnet 1.11.

diff --git a/include/dnet/os.h b/include/dnet/os.h
index c12c7b2..9e8bdd2 100644
--- a/include/dnet/os.h
+++ b/include/dnet/os.h
@@ -23,8 +23,10 @@
   typedef u_short	uint16_t;
   typedef u_int		uint32_t;
 # ifndef __CYGWIN__
+# ifndef _SSIZE_T_
   typedef long		ssize_t;
 # endif
+# endif
 #else
 # include <sys/param.h>
 # include <sys/types.h>
-- 
1.7.6