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


diff -Naur mysql-5.1.32.orig/include/my_sys.h mysql-5.1.32/include/my_sys.h
--- mysql-5.1.32.orig/include/my_sys.h	2009-02-13 19:52:19.000000000 -0500
+++ mysql-5.1.32/include/my_sys.h	2009-03-04 18:08:40.000000000 -0500
@@ -199,13 +199,8 @@
 #define my_afree(PTR) my_free(PTR,MYF(MY_WME))
 #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 NEAR curr_dir[];		/* Current directory for user */