diff -Naur mysql-5.0.15.orig/include/my_global.h mysql-5.0.15/include/my_global.h
--- mysql-5.0.15.orig/include/my_global.h	2005-10-16 21:27:27.000000000 -0400
+++ mysql-5.0.15/include/my_global.h	2005-11-02 16:16:37.000000000 -0500
@@ -107,6 +107,10 @@
 #define _GNU_SOURCE 1
 #endif
 
+#ifdef __linux__
+#define HAVE_ERRNO_AS_DEFINE
+#endif
+
 /*
   Temporary solution to solve bug#7156. Include "sys/types.h" before
   the thread headers, else the function madvise() will not be defined