--- Coro-Multicore/xthread.h	2015/07/05 03:50:57	1.3
+++ Coro-Multicore/xthread.h	2015/07/05 04:13:52	1.4
@@ -168,7 +168,8 @@
 
 #endif
 
-#if __linux && __GNUC__ >= 4 && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 9
+#if __linux && __GNUC__ >= 4 && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 3 && 0
+/* __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)      
 # define X_TLS_SET(varname,value) varname = (value)