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@@ -49,10 +49,22 @@ static init_main_thread_tls imtl;
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 static register_thread_with_backtrace main_thread_registration("Main thread");
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 static trace_point main_thread_entry_point("main thread entry point", NULL, 0);
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-// boost::thread_specific_storage is pretty expensive. So we use the __thread
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-// keyword whenever possible - that's almost free.
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+/*
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+ * boost::thread_specific_storage is pretty expensive. So we use the __thread
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+ * keyword whenever possible - that's almost free.
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+ * GCC supports the __thread keyword on x86 since version 3.3. Not sure
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+ * about other architectures.
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+ */
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+
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+#if defined(__GNUC__) && (                       \
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+   __GNUC__ > 3 || (                             \
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+       __GNUC__ == 3 && __GNUC_MINOR__ >= 3      \
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+   )                                             \
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+)
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+	#define GCC_IS_3_3_OR_HIGHER
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+#endif
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-#if 1
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+#ifdef GCC_IS_3_3_OR_HIGHER
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   static __thread boost::mutex *backtrace_mutex = NULL;
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   static __thread list<trace_point *> *current_backtrace = NULL;
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