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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 */
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