Add default case (standard conformance) to avoid piling up
system specific #ifdefs.
diff --git a/Python/thread_pthread.h b/Python/thread_pthread.h
index 8e6ca86..5b70fa4 100644
--- a/Python/thread_pthread.h
+++ b/Python/thread_pthread.h
@@ -66,12 +66,12 @@
 #    define PY_PTHREAD_D7
 #  endif
 
-#elif defined(__unix) && defined(__sparc)
-#  define PY_PTHREAD_STD
-#elif defined(__linux)
-#  define PY_PTHREAD_STD
 #elif defined(__DGUX)
 #  define PY_PTHREAD_D6
+
+#else /* Default case */
+#  define PY_PTHREAD_STD
+
 #endif