make tm_zone etc visible under _GNU_SOURCE

diff --git a/include/time.h b/include/time.h
index 4a681b4..aa4efff 100644 (file)
--- a/include/time.h
+++ b/include/time.h
@@ -39,7 +39,7 @@ struct tm
        long __tm_gmtoff;
        const char *__tm_zone;
 };
-#if defined(_BSD_SOURCE)
+#if defined(_BSD_SOURCE) || defined(_GNU_SOURCE)
 #define tm_gmtoff __tm_gmtoff
 #define tm_zone __tm_zone
 #endif