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"extern int errno" is just a really bad idea.
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diff -up mariadb-5.5.33a/include/my_sys.h.p1 mariadb-5.5.33a/include/my_sys.h
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--- mariadb-5.5.33a/include/my_sys.h.p1	2013-09-20 00:34:26.000000000 +0200
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+++ mariadb-5.5.33a/include/my_sys.h	2013-10-21 14:46:46.866624871 +0200
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@@ -190,13 +190,8 @@ extern void my_large_free(uchar *ptr);
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 #define my_safe_alloca(size, min_length) ((size <= min_length) ? my_alloca(size) : my_malloc(size,MYF(MY_FAE)))
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 #define my_safe_afree(ptr, size, min_length) ((size <= min_length) ? my_afree(ptr) : my_free(ptr))
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-#ifndef errno				/* did we already get it? */
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-#ifdef HAVE_ERRNO_AS_DEFINE
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 #include <errno.h>			/* errno is a define */
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-#else
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-extern int errno;			/* declare errno */
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-#endif
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-#endif					/* #ifndef errno */
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+
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 extern char *home_dir;			/* Home directory for user */
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 extern MYSQL_PLUGIN_IMPORT char  *mysql_data_home;
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 extern const char *my_progname;		/* program-name (printed in errors) */