diff --git a/config.h.in b/config.h.in
index d4f97d82d..00679d73e 100644
--- a/config.h.in
+++ b/config.h.in
@@ -9,6 +9,9 @@
 /* Define if you have the vprintf function.  */
 #undef HAVE_VPRINTF
 
+/* Define if you need to in order for stat and other things to work.  */
+#undef _POSIX_SOURCE
+
 /* Define as the return type of signal handlers (int or void).  */
 #undef RETSIGTYPE
 
@@ -39,6 +42,9 @@
 /* Define to package name */
 #undef PACKAGE
 
+/* Define if you need to in order for stat and other things to work.  */
+#undef _POSIX_SOURCE
+
 /* Define as the return type of signal handlers (int or void).  */
 #undef RETSIGTYPE