Add pthred-std define for Linux.
diff --git a/Python/thread_pthread.h b/Python/thread_pthread.h
index 6b97e8d..517def5 100644
--- a/Python/thread_pthread.h
+++ b/Python/thread_pthread.h
@@ -68,6 +68,8 @@
 
 #elif defined(__unix) && defined(__sparc)
 #  define PY_PTHREAD_STD
+#elif defined(__linux)
+#  define PY_PTHREAD_STD
 
 #endif