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"extern int errno" is just a really bad idea.


diff -up mysql-5.5.28/include/my_sys.h.p1 mysql-5.5.28/include/my_sys.h
--- mysql-5.5.28/include/my_sys.h.p1	2012-08-29 10:50:46.000000000 +0200
+++ mysql-5.5.28/include/my_sys.h	2012-12-06 14:09:15.218170154 +0100
@@ -197,13 +197,8 @@ extern void my_large_free(uchar *ptr);
 #define my_afree(PTR) my_free(PTR)
 #endif /* HAVE_ALLOCA */
 
-#ifndef errno				/* did we already get it? */
-#ifdef HAVE_ERRNO_AS_DEFINE
 #include <errno.h>			/* errno is a define */
-#else
-extern int errno;			/* declare errno */
-#endif
-#endif					/* #ifndef errno */
+
 extern char *home_dir;			/* Home directory for user */
 extern const char *my_progname;		/* program-name (printed in errors) */
 extern char curr_dir[];		/* Current directory for user */