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-rw-r--r--system/features.h7
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diff --git a/system/features.h b/system/features.h
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+/* use __errno_location instead of errno */
+#define WANT_THREAD_SAFE
+
+/* on i386, Linux has an alternate syscall method since 2002/12/16 */
+/* on my Athlon XP, it is twice as fast, but it's only in kernel 2.5 */
+/* 20040118: enabling this breaks User Mode Linux! It's their fault. */
+#define WANT_SYSENTER