putenv
diff --git a/config.h.in b/config.h.in
index 33b0044..65edee9 100644
--- a/config.h.in
+++ b/config.h.in
@@ -187,6 +187,9 @@
 /* Define if you have the plock function.  */
 #undef HAVE_PLOCK
 
+/* Define if you have the putenv function.  */
+#undef HAVE_PUTENV
+
 /* Define if you have the readlink function.  */
 #undef HAVE_READLINK