--- Coro-Multicore/xthread.h	2015/07/05 04:13:52	1.4
+++ Coro-Multicore/xthread.h	2015/07/27 12:05:09	1.5
@@ -168,7 +168,7 @@
 
 #endif
 
-#if __linux && __GNUC__ >= 4 && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 3 && 0
+#if __linux && __GNUC__ >= 4 && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 3 && 0 /* also check arch */
 /* __thread has little to no advantage over pthread_* in most configurations, so this is not used */
 # define X_TLS_DECLARE(varname)   __thread void *varname
 # define X_TLS_INIT(varname)