Undef feature selection macros before defining.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/lread.c b/src/lread.c
index 8b2564c3792..699c7fc2ef9 100644
--- a/src/lread.c
+++ b/src/lread.c
@@ -21,7 +21,12 @@ Boston, MA 02111-1307, USA.  */
 
 
 #include <config.h>
+/* The following feature selections should be in config.h, but that
+   causes at best a host of warnings on some systems.  */
+#undef _XOPEN_SOURCE            /* Avoid warnings about redefinition
+                                   in some cases.  */
 #define _XOPEN_SOURCE 500       /* for Unix 98 ftello on GNU */
+#undef __EXTENSIONS__
 #define __EXTENSIONS__          /* Keep Solaris 2.6 happy with the
                                    above, else things we need are hidden.  */
 #include <stdio.h>